compression ratio

[92ranger18]

I plan on putting a turbo on my v8 in my ranger. my question is can i double up the head gaskets to lower my comp. ratio. or buy a set of aftermarket gaskets that are thicker. How much thicker do they need to be. trying to get away without tearing the motor apart to install dish top pistons. if i do will i need longer pushrods? if so how do i know how much longer i need them to be?

 

[wr250rdr]

How many pounds of boost are you planning on running? What is your comp ratio as of now? Also are you running factory pistons? You might want to pull it down and put in forged pistons if you want to run more then 8 pounds of boost.

In MHO I would pull it down because the idea of punching a hole in the top of a piston and leaving me stranded is less attractive then pulling a building a motor

But in answer to your question I would not double up head gaskets it creates too many weak points. I know there are companies that make custom gaskets but they can be pricy and I think you will be SOL on finding pushrods that are the right length.

 

[92ranger18]

Its all stock so the compression ratio is also stock. i want to get it all mocked up and probably run it for a few minutes. if it does blow up i got a 3 year waranty. its only a year old. also if it did go kaput i could get a new motor and a set of pistons

 

[Hahnsb2]

You definitely can't stack headgaskets

Stock motor is probably around 9:1 and will take boost just fine.

 

[92ranger18]

Stock motor is probably around 9:1 and will take boost just fine.[/QUOTE]

How much boost? i realy havent found a straight answer on the web

 

[92ranger18]

Also would i have to adjust the timing any

 

[wr250rdr]

8 to 10 pounds is a safe number and yes you will have to play with
Your timing how much I don't know

 

[92ranger18]

8 to 10 pounds is a safe number and yes you will have to play with
Your timing how much I don't know

Do u know if i advance or retard. or how i tell when its right when i do adjust it?

 

[Hahnsb2]

Get off TRS and start reading up, it's clear you are in way over your head here. No offense.

 

[wr250rdr]

Honestly it has been forever since I have built a boosted motor. I forget which way you gotta go. But they do make ignition modules that plug right in and allow you to easily adjust your timing. If I remember right you retard the timing. And by doing that it helps to fight detonation

 

[disciplerocks]

Lowering your compression ratio is the opposite of adding boost. I don't know why you would want to do that. Stay stock.

 

[wr250rdr]

You lower your comp to allow for more. It's a strange concept but it's how it works by lowering the comp before you add boost along with adding stronger pistons you allow for more static pressure coming in at a constant from the turbo

 

[disciplerocks]

If you are pushing 20+ lbs, I could see that. But with most mild builds, a bump up in compression would do you better.

 

[wr250rdr]

Ya but let's be honest how many builds have started at 8 pounds and walked their way up to 15 or 20. Boost is addicting so might as well build for the eminent right?

 

[wr250rdr]

And actually a bump up would cause longevity issues the point of boosting is to add in more air and fuel to be compressed. A bump up would create higher over all compression in the cylinder and with cast pistons that is asking for trouble