how to find engine compression ratio on 3.2?
 

i am debating about supercharging my car and had a few questions regarding engine compression ratio. how would i know my compression ratio on my engine its a stock 3.2 i bought it from a local porsche mechanic, and i have no clue what the compression ratio it has? whats the various ways to find out the compression ratio?

If your 3.2 is in stock configuration, it is either a 9.5 or 10.3 CR depending on whether it is a USA or ROW model.

The serial number and engine type number will tell you if it is the ROW model with higher CR.

Also note that these are nominal numbers from Porsche. Actual compression ratios are about .5 lower. To get the full compression you will need to shave the heads and/or run minimal deck height.

-Andy

well this is beyond my knowledge so whats the minimal deck height?

Then you have to realize that all the euro/ROW are not the 10.3 but the 9.5 of the US versions, this keeps the prices of the euro down because the compression is dual plug or super gas.
Bruce

well the numbers i got off engine 64F0S060 is mine euro?

64F...is the USA version with the lower CR

kinein,

I see you got your engine number question answered before I could respond to your PM.


I would tread very carefully in your supercharger considerations.

Your first hurtle is going to be your available gas and your willingness to source and use very high octane race gas.
I pay US$8.00/gallon for 100 octane unleaded and consider us lucky for commercial access here in Denver.
You may need to deal with 55-gal drums of 114 octane for a bit more cost and a lot more aggravation.

Next will be the configuration of your engine.
Twin ignition will mitigate the octane requirements only a bit.
All of the machinery (crank, rods, pistons, oiling, etc.) will need to be up to the task.
EDIT: Much of the installation will be ‘custom’, non-original, non-Porsche parts that will be difficult to source as service and replacement parts.

Finally, thermal stress will be your big enemy.
Your 3.2 is already ‘thermally challenged’ under many conditions.
Adding a supercharger will only exacerbate the situation.
There are only a few things you can do: turn the cooling fan faster, add front coolers and direct more air through the engine by eliminating the heat exchangers and engine cooler.
The ‘Rubbermaid Solution’ will fix the issue but is unsuitable for other than track use.


You currently have a very nice, reasonably powerful 911 that is suitable for daily driving and cross-country trips for decades to come.
It is easily services and repaired anywhere in the world.
There are a few mods (including installing a later, larger displacement, more powerful engine) that will increase the performance without chaining you to unique fuel and specialized service.

I hope this helps with your decision.

Best,
Grady

i just wanted to put lil paxton on there with 6psi and call it a day maybe add intercooler i plenty of room under the wing. i have seen a few setups that are like that and the owners say its plenty of power for there daily driver. i want to join that club lol

http://forums.pelicanparts.com/uploa...1308285654.jpg


http://forums.pelicanparts.com/uploa...1308285683.jpg

i have so much space in there it needs something to fill in the space?