Hi all,

 

As above how can i find out or estimate the compression ratio of my engine?

 

Its going to be higher than standard because of the head gasket thickness ive got.

 

I know the normal route these days is to go low comp but my build has ended up high comp along the way lol.

 

Ive been told of a few pros and cons...but has anyone else gone this route before?

Hi all,

 

As above how can i find out or estimate the compression ratio of my engine?

 

Its going to be higher than standard because of the head gasket thickness ive got.

 

I know the normal route these days is to go low comp but my build has ended up high comp along the way lol.

 

Ive been told of a few pros and cons...but has anyone else gone this route before?

 

 

High compression and forced induction is not the way to go, increased chance of knocking, are you putting thinner gaskets on then? or have the heads been skimmed?

 

Jeff TT

Yea basically the heads were skimmed and i was supplied with .45 cometic gaskets which i understand is standard thickness?

 

The Garage that built the heads said they were only skimmed to a minimal amount so im guessing a nats cock?

Not noticing the mistake untill the engine was built i contacted the supplier who said the thickness will be fine?

 

This has been bugging me for a while and its not the first time ive questioned it on here, Ive had mix reviews on running the gasket but i also understand by running a stand alone ECU more tuning adjustments can be made to hopefully get around the det problem.

 

Thanks Dan

I think you're overthinking it!

Yea as always brain ache lol

If its just been skimmed a minimal amount then its going to make virtually no difference to stock.

 

If you really want to work out your compression ratio then it is as follows:

 

CR = SV+CV/CV

 

Where the Compression ratio = the swept volume of the cylinder plus the clearance volume divided by the clearance volume.

 

The clearance volume is anything above the swept volume including combustion chamber, head gasket thickness, cutouts in pistons etc

 

Handy calculator here if you know all the measurements: http://www.csgnetwork.com/compcalc.html

 

Probably all a bit OTT if its just a minor skim tho! :)

Yea basically the heads were skimmed and i was supplied with .45 cometic gaskets which i understand is standard thickness?

 

The Garage that built the heads said they were only skimmed to a minimal amount so im guessing a nats cock?

Not noticing the mistake untill the engine was built i contacted the supplier who said the thickness will be fine?

 

This has been bugging me for a while and its not the first time ive questioned it on here, Ive had mix reviews on running the gasket but i also understand by running a stand alone ECU more tuning adjustments can be made to hopefully get around the det problem.

 

Thanks Dan

 

iff the shop supplied the standed gaskets then sounds like they done just whats known in the trade as "a scrape" to clean the surface up

The work shop skimmed the heads and i got the head gaskets from the states but by the sounds of it i am worring over nothing as long as the heads wasnt skimmed that much. Happy days :)

 

Thanks for your help everyone