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 Prowler 5.7L Hemi Install (Page 3)
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| Author | Topic: Prowler 5.7L Hemi Install |
cdeluca99   POA Site Supporter Prowler Junkie From:Patchogue, NY, USA |
posted 01-31-2024 02:56 AM
    
quote: I’ve heard this before but what about the over head cams? There ain’t a Hemi that I’ve seen before with overhead cams . It can’t be the crank because of the overhead cams there would be no gear for timing chain. Maybe connecting rods that are the same? Hemi has 2 valves per cylinder we have 4. Can someone please explain exactly what makes it a semi-Hemi. Mechanically speaking they’re both completely different. Overhead cams means no pushrods, the rocker arms must be completely different. Hence not Hemi heads, Honda 4 bangers have plugs thru the heads too. A lot of smaller engines do. This message has been edited by cdeluca99 on 01-31-2024 at 03:12 AM |
BeWare                     POA Site Supporter Prowler Junkie From:Acworth , Georgia , USA |
posted 01-31-2024 09:46 AM
The head of a hemispherical combustion chamber A hemispherical combustion chamber is a type of combustion chamber in a reciprocating internal combustion engine with a domed cylinder head notionally in the approximate shape of a hemisphere (in reality usually a spheric section thereof). An engine featuring this type of hemispherical chamber is known as a hemi engine. Hemi Cylinder Head
Found this on the net supposed to be a
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cdeluca99 POA Site Supporter Prowler Junkie From:Patchogue, NY, USA |
posted 01-31-2024 10:28 AM
I understand. Again tho the Hemis a 2 vale and we have 4. Those chambers look absolutely nothing alike to me. I think we've gotta go deeper? You agree? This may be a myth someone stared to make themselves feel better about the 6 cylinder. A Chevy 4.3 is a 5.7 with two cylinders lopped off. BUT the cams in the same spot. The basic engine design is the same. There's no over head cam Hemi in existence to my knowledge. I understand the Hemi and why its called that but Hemi heads DO NOT have cam bosses in the casting. I don't know, I HOPE Tony chimes in. I don't think it's got anything to do with Hemi except it's Mopar too
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Tomcal POA Site Supporter Prowler Junkie From:Long Island, NY, USA |
posted 01-31-2024 01:22 PM
It's probably best to refer to the original Mopar 426 cu.in. Hemi as the "Elephant" motor. Those old enough, remember it well. Of course, the marketing dudes at Chrysler re-birthed the name "Hemi" and "Elephant" in their latest nostalgia kick. Think Hellephant...... http://www.caranddriver.com/news/a32816098/dodge-demon-hellephant-dyno-video-revealed/
http://thegearheadgirl.com/features/chrysler-hemi-engine/
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alrtg POA Site Supporter Prowler Junkie From:Westminster, MD, USA |
posted 01-31-2024 03:35 PM
The first Hemi engine I ever saw was a 354 that was intended to go in a 1940 Ford but never made it. My Dad bought the car but the engine stayed in the barn where it had been for years. This was back in the late '60's or maybe the early '70's. This message has been edited by alrtg on 01-31-2024 at 03:36 PM |
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cdeluca99 POA Site Supporter Prowler Junkie From:Patchogue, NY, USA |
posted 01-31-2024 03:48 PM
Our engines ain’t semi Hemis. Totally different engine. UPDATE John, I stand corrected. Thank you 😊 This message has been edited by cdeluca99 on 02-04-2024 at 03:00 AM |
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onecatnodog From:Arvada, CO, United States |
posted 02-01-2024 12:19 PM
I have owned a few Hemi Cars in my day and I'm siding with the Prowler 6 cyl is Hemi Design.. 1964 was the first year of the double over head Chrysler Hemi.. John(onecatnodog)  |
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onecatnodog From:Arvada, CO, United States |
posted 02-01-2024 12:22 PM
They are a Hemi Design no matter how many cams they have its the combustion chamber that makes them a Hemi.. Pistons will have a Lil' Dome to them.. John(onecatnodog) |
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Tomcal POA Site Supporter Prowler Junkie From:Long Island, NY, USA |
posted 02-01-2024 12:22 PM
What is a semi-hemi???? |
ed monahan POA Lifetime Site Supporter Prowler Junkie Personal ScrapBook From:Cincinnati, Oh, USA |
posted 02-01-2024 02:12 PM
DUH, for 18 wheelers! lol |
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onecatnodog From:Arvada, CO, United States |
posted 02-01-2024 08:42 PM
A Semi Hemi would be like the Ford BOSS 429 It would be half Circle combustion chamber.. Chrysler even made a Ball Stud Hemi and that one had rockers like a Big Block Chevy John(onecatnodog) This message has been edited by onecatnodog on 02-01-2024 at 08:45 PM |
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cdeluca99 POA Site Supporter Prowler Junkie From:Patchogue, NY, USA |
posted 02-02-2024 06:44 PM
So our engine is a Hemi? John? I don't trust internet pics and you know way more than me I'm sure. If the pics of the heads are accurate, please explain exactly what you mean? I was always under the impression Hemi was a Hemi because of its heads and pistons. Prowler pistons I have seen are flat top. Hemi pistons look different and the head I ain"t sold on because the combustion chamber is totally different. please explain it to me? I really don't understand. I'm a chassis guy lol
quote: This message has been edited by cdeluca99 on 02-02-2024 at 06:45 PM |
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BeWare POA Site Supporter Prowler Junkie From:Acworth , Georgia , USA |
posted 02-02-2024 07:49 PM
This is a post I made in 2004. Dave, I am not a gear head by any stretch. The term Hemi as I understand it, does not realte to the number of cylinders, rather it refers to the head design. The heads on the 3.5 are close enough in design to be considered hemispehrical, with the spark plug also in the center of the head and chamber and valves on either side. I had a conversation with Jerrry Scholten at CTC where he confirmed what I had heard. Mike K also had a head on display in his museum at the Stampede event in Texas. Sure looked like a Hemi to me. But again I am not an expert. Also on his Prowler drag car he has a sticker on the back "Yeah It's Got a Hemi" so I guess he agrees. Dean at Prowler Pro also referred to it as a Hemi when I meet him at Prowlin The Rockies in CO. http://www.prowleronline.com/ubb/Forum2/HTML/001914.html This message has been edited by BeWare on 02-02-2024 at 07:50 PM |
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BeWare POA Site Supporter Prowler Junkie From:Acworth , Georgia , USA |
posted 02-02-2024 07:52 PM
I found this also and thought it was interesting. I've been researching the purchase of a new Chrysler 300 and have been undecided on which engine to choose. I'm drawn to the 5.7 L Hemi but have yet to find a dealer who's willing to do a Friends & Family purchase on a 300C (the hemi model) becasue of the demand for the car and a shortage of hemi engines. They will do F&F on a 300 Limited or Touring model which come with a 3.5 L V6 (a Prowler engine). BTW, if anyone knows a dealer that will do F&F on a 300C, please let me know. http://www.prowleronline.com/ubb/Forum2/HTML/001914.html This message has been edited by BeWare on 02-02-2024 at 07:54 PM |
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cdeluca99 POA Site Supporter Prowler Junkie From:Patchogue, NY, USA |
posted 02-03-2024 04:07 AM
3.5 L V6 250HP / 3.5L = 71.4 HP per Liter of displacement 5.7 L Hemi 340HP / 5.7L = 59.6 HP per Liter of displacement Very interesting. I love learning things from you guys!! Thank you. I love the little 3.5 Headers, full exhaust, gears cold air intake and the spark plug trick really wake it up. This message has been edited by cdeluca99 on 02-03-2024 at 04:08 AM |
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onecatnodog From:Arvada, CO, United States |
posted 02-03-2024 05:31 AM
I'm not one that knows it all but I have some incite. Technology has changed and a lot has been learned over the years.. Hemispherical is the term for the cylinder head and it's dome design.. In the olden days the piston used to come way out of the cylinder bore to match the dome in the cylinder head. That was needed to get the compression up to the 11 to 1 or 12 to 1 compression ratio to fill that dome and I have seen it as much as 15 to 1 on a naturally asperated engines on mostly Drag cars. Also in the old days I used to take the early Mopar Poly headed 318 engines and put the old Hemi Heads on them with a piston change and would give the Hemi look in the old street cars and roadsters. Back when you would be able to get Hi octane gas needed to stop pre ignition in these Hi Compression Engines. With low compression you couldn't make as much power. How ever the dome on the piston would slow and distort flame travel in the cylinder and not give you a perfect burn in the combustion chamber. Eliminate the big dome piston and you can run less octane gas as it will lower the compression ratio and have a just about perfect flame travel across the piston in the cylinder giving it a full burn making it more emission friendly and more power while being able to run lower octane gas. The factory Prowler is close to 10 to 1 just under that.. The strokers that I was doing is closer to 11 to one. Again this is just my opinion and how onecatnodog sees things.. Prowler is Hemi Head design, and so are a bunch of the import cars out there. Rule of thumb is that if the spark plug goes in threw the valve cover it has a Hemi style head.. Of course the flat head engine is a totally different animal. John(onecatnodog)
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Tomcal POA Site Supporter Prowler Junkie From:Long Island, NY, USA |
posted 02-03-2024 12:35 PM
Chrysler Gen-III 5.7 "HEMI" engine is a "semi-oblate spheroid!" "And yet, one "hemi" cylinder head—the Chrysler Gen-III Hemi—is not a hemispherical cylinder head in the classic sense. Its combustion chamber is actually taken from a section of a flattened sphere, and that means it more correctly would be called a semi-oblate spheroid. If those words don't register, think of a semi-oblate spheroid as an ellipse that has been rotated around one of its two axes. Cool geometry trivia: A sphere is a special case of an oblate spheroid, the only difference being that it looks the same when the ellipse (in this case, a circle) is rotated along either of its two axes. Chrysler's Gen-III Hemi If the 2003-present Gen-III Hemi isn't a real hemi engine, then why do we call it that? With good reason, Chrysler (now FCA) wanted to extend the "Hemi" branding to its third-generation Hemi V-8 because of the instant recognition and status it carries (i.e. 426 Hemi-Elephant). In this case, we can give FCA a pass because a flattened sphere (a semi-oblate spheroid) has all the positive traits of a real hemi (valve size, port flow, flow quality, burn time/efficiency) with far fewer of its problems. And like all hemis, FCA's third-generation unit responds in classic fashion to the application of boost in the Jeep Trackhawk, Hellcat, and Demon Hemi variants—currently the most potent domestic production car engines ever. Combustion efficiency of the Gen-III Hemi is excellent, with its shape enhancing the combustion environment with a fast rise time just like a "real" hemi. It does this through the same mechanism as a hemi—through a surface shaped to focus the expanding burn front into the shortest practical event. Unlike a true "hemi," the Gen-III has quench pads on the side to aid squish and help lower the NOX emissions, while dual plugs on a waste-spark ignition reduce the remaining NOX to EPA-approved levels. So, for those on a Hemi-hating binge, you're on the hook for calling it a "semi-oblate spheroid!".... Source, Motor Trend SO, is it a HEMI, SEMI-HEMI or "SEMI-OBLATE-SPHEROID". AND... does it really matter. |
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onecatnodog From:Arvada, CO, United States |
posted 02-03-2024 03:20 PM
Before we give up the goodies as we call them the 426 was not a true hemi either like the earlier hemi engines made. The heads were canted on the 426 engines to fit in the cars to be able to put exhaust manifolds on them. Were the original true Hemi like the P-47 Thunderbolt fighter aircraft, with a 2,500 horsepower V-16 or the Chrysler Fire Power Hemi 331, 354, 392 to name a few the dome was directly over the piston hole and all other models were take offs of the original design. Heck in 1924 Chrysler was doing research on the basic hemi design and actually produced a prototype hemi that was an inline-6. So I guess we need to explain what "hemi" means, because there's some nuance to the hemi code. If you are, say, a copy editor for HOT ROD, a "hemi" refers to a type of engine with a combustion chamber design that consists of a pent-roof shape with valves canted to the center of the bore. This design admits more air and fuel into the cylinder because the total valve curtain area is significantly greater than in a comparable wedge-shaped combustion chamber. Lots of other Hemi engines manufactures or so called Hemi engines out there and here are some.
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onecatnodog From:Arvada, CO, United States |
posted 02-03-2024 03:25 PM
 Micky Thompson Ford FE Hemi
This message has been edited by onecatnodog on 02-03-2024 at 04:13 PM |
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onecatnodog From:Arvada, CO, United States |
posted 02-03-2024 03:31 PM
 Jon Kaase Racing Boss Nine
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onecatnodog From:Arvada, CO, United States |
posted 02-03-2024 03:34 PM
I think instead of calling all these engines NOT A HEMI you need to go back to my pulled quote of Hot Rod Mag on what people think is a Hemi... John(onecatnodog) "If you are, say, a copy editor for HOT ROD, a "hemi" refers to a type of engine with a combustion chamber design that consists of a pent-roof shape with valves canted to the center of the bore. This design admits more air and fuel into the cylinder because the total valve curtain area is significantly greater than in a comparable wedge-shaped combustion chamber. This message has been edited by onecatnodog on 02-03-2024 at 03:38 PM |
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onecatnodog From:Arvada, CO, United States |
posted 02-03-2024 03:41 PM
So in my opinion that the Prowler is a Baby Hemi at 3.5 and I was making them into a Baby 5.0 stroker.. Is it a true Hemi.. NO.. Can it be called a Hemi... I do, but that's just me.. John(onecatnodog) |
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Tomcal POA Site Supporter Prowler Junkie From:Long Island, NY, USA |
posted 02-05-2024 11:31 AM
3.5L Head, Interference engine (typical), 1999 Prowler and up....
3.5L Interference engine, recessed top Piston, Prowler 1999 and up....
3.5L Non-Interference engine, Piston with value reliefs, Prowler 1997....
426 cu.in. Hemi-Elephant, Head....
426 cu.in. Hemi-Elephant, Dome piston....
Chrysler 5.7L Hemi, Head....
Chrysler 5.7L Hemi, flat top Piston....
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onecatnodog From:Arvada, CO, United States |
posted 02-05-2024 10:15 PM
Dome piston impedes flame travel.. One of the reason for twin plug heads.. Dished pistons have the best flame travel.. John(onecatnodog) |
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Rocker5433 From:Tierra Verde, FL, United States |
posted 02-25-2024 08:39 AM
Sorry to say but I sold the Hemi Prowler. Had lots of positive comments on the install. It was a fun project! |
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