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 High compression ratio of stock motor & paxton
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| Author | Topic: High compression ratio of stock motor & paxton |
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FatManInTheBathTub Prowler Junkie From:Palm Coast, FL. |
posted 12-05-2000 07:52 AM
    
Hey now. I've purchased a Paxton system but I am worried about blowing head gaskets as the stock motor is 10.5/1. Any of you guys know what compression ratio you have now with your supercharger??? Anyone blown a head gasket yet??? |
dpena            POA Site Supporter Administrating Kat Visit Dan's Prowler Excitement Personal ScrapBook From:San Jose Ca Santa Clara |
posted 12-05-2000 02:32 PM
FatManInTheBathTub, On my last dyno run I did on my Prowler. I almost thought I blew a head gasket. It turned out it was a fouled plug and the coil and harness for cylinder #6 was replaced. I have been running ever since. No issues here! Check out my page on that moment in time! http://www.dpena.com/DanPenaProwler/DynoPhenomena/ulthm.htm Later... ------------------ This message has been edited by dpena on 12-05-2000 at 02:41 PM |
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FatManInTheBathTub Prowler Junkie From:Palm Coast, FL. |
posted 12-09-2000 09:16 AM
thanks Dan, but what compression ratio do you get with the supercharger???........so many supercharged prowlers and so few options.............. |
jd2ksilver POA Site Supporter Prowler Junkie Personal ScrapBook From:Mt. View, CA |
posted 12-09-2000 11:53 PM
Ok a question here,,, Why would the compression change in the first place??? No changes are made to the cylinder or piston or valve train>>>???? Also as I understand, the only computer or black box work is with the fuel entering the throttle body,, This message has been edited by jd2ksilver on 12-09-2000 at 11:54 PM |
butchcee POA Site Supporter Prowler Junkie From:Lake Ariel, Pa. |
posted 12-10-2000 05:26 AM
while the static compression ratio remains at a tad under 10-1, the realized ratio with boost will be much higher. Anybody got a chart or something to figure this out? ------------------ |
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jd2ksilver POA Site Supporter Prowler Junkie Personal ScrapBook From:Mt. View, CA |
posted 12-10-2000 11:11 AM
your right butchee, my bad,, I woke up this am and it came to me. Interested here also. |
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Gary C POA Site Supporter Prowler Junkie Personal ScrapBook From:San Diego Area |
posted 12-10-2000 12:12 PM
: You are better off with a low compression/high boost combination. The combination of supercharger boost coupled with your static or geometric compression ratio provides a resultant Effective Compression Ratio. There is a complex formula for determining the Effective Compression Ratio. However as an example if you are running an 8.75:1 static compression ratio and 6 pounds of boost you will have an Effective Compression Ratio of 12.32:1. Under normal circumstances with a Centrifugal blower you can usually run an Effective Compression Ratio of from 12.50:1 to 13.10:1. ------------------ |
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Gary C POA Site Supporter Prowler Junkie Personal ScrapBook From:San Diego Area |
posted 12-10-2000 12:14 PM
click here for more info on a Supercharger |
Nelson Weber Prowler Junkie Personal ScrapBook From:High Ridge, Mo USA |
posted 12-10-2000 12:16 PM
Since I'm a mechanical engineer, I'll give you the engineering calculations. Since atmospheric pressure at sea level is 14.7 psi, a 10 to 1 compression ratio would say that a cylinder compression check gage would read 10 times 14.7, or 147 psi. If you had 7 psi boost, add that to 14.7, which equals 21.7 psi; multiply times 10 (compression ratio) for a cylinder pressure of 217 psi. Since the real world rarely agrees with the analytical world, these figures won't be exact. Usually it is hard to get all the atmospheric pressure into the cylinders, so the real numbers will probably be less. |
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Gary C POA Site Supporter Prowler Junkie Personal ScrapBook From:San Diego Area |
posted 12-10-2000 12:20 PM
How about 15.1 at 9 lbs of boost Click here Go to bottom of page for chart ------------------ |
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jd2ksilver POA Site Supporter Prowler Junkie Personal ScrapBook From:Mt. View, CA |
posted 12-10-2000 12:52 PM
very informative Gary, thanks, learning more and more on here,,  ------------------ |
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butchcee POA Site Supporter Prowler Junkie From:Lake Ariel, Pa. |
posted 12-10-2000 02:14 PM
Thanks Gary and Nelson!! Hey Gary, shouldn't you be eating cake or something instead of fielding questions? ------------------ |
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FatManInTheBathTub Prowler Junkie From:Palm Coast, FL. |
posted 12-11-2000 07:44 AM
Hey now, so if the stock compression is 10/1 or 10.5/1, why isn't anyone blowing head gaskets???? |
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butchcee POA Site Supporter Prowler Junkie From:Lake Ariel, Pa. |
posted 12-11-2000 08:28 AM
Why should they FMIABT? Just because the compression is raised doesn't mean the gasket will go. As long as there is no serious overheating allowing the heads to stretch and warp, there will be intregity. Maybe there was a focus in the design stage to ensure a good seal or gasket. The Honda's run much higher realized compression then us and dont blow gaskets. I had a friend with a turbo OMNI that used to crank it up with stock gaskets and no failure. ------------------ |
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FatManInTheBathTub Prowler Junkie From:Palm Coast, FL. |
posted 12-11-2000 08:48 AM
hey now, well I have lost my fear of blowing head gaskets as no one has blown one yet. The only problems I have seen is Dan P. with his coil failure and overheating problems. I am at sealevel on the east coast of FL. Like the sticker says "NO FEAR"........... |
AL
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