Rb20Det Head

[david69]

I obtained a recoed head that has been skimmed.my question I,s how to tell what the minimum thickness is,where do I measure it from and will I need a thicker head gasket.cheers

[ZRBE]

Looks like your head is thick enough!

Sorry, but what?

Thickness of the cylinder walls? Or just the whole thing?

And why would it need to be thicker?

Edited July 22, 2013 by Zrobe

[Piggaz]

CC the head and work backwards from there.

[zebra]

^^ This

But still hard to tell how much was skimmed

[StevenCJR31]

compare it with an unskimmed head. . easy enough to find one im sure

[XRATED]

don't worry about it.... as long as it's straight, bolt it on.

[david69]

this was useful.thanks

Looks like your head is thick enough!
Sorry, but what?
Thickness of the cylinder walls? Or just the whole thing?
And why would it need to be thicker?

[david69]

Surely there is a limit as too the maximum amount that the rb20det head can be skimmed.there must be a way to measure maybe a reference point on the top of the head to the block mating surface.i don't want to buy another unskimmed head as a reference, as that will tell me nothing other than mine is thinner.i just want to make sure im not gonna increase my compression ratio on my stock bottom end and damage anything.

[XRATED]

At the end of the day, someone will have had to really hack into the thing for it to be considered 'too thin' to use. Not too many machinists would do that.

Rb20det comes from the factory with quite a low compression ratio as it is. A couple points more static CR is only a good thing.

When you put it back together, just be sure to get it on a dyno.

Cheers

J.

[LANDSCRIBBLE]

maybe use a thicker headgasket if you're so worried and not sure? I guess aslong as the valves dont touch any pistons it should be fine.

[david69]

thanks guys that seems like some good advice.

[StevenCJR31]

At the end of the day, someone will have had to really hack into the thing for it to be considered 'too thin' to use. Not too many machinists would do that.

Rb20det comes from the factory with quite a low compression ratio as it is. A couple points more static CR is only a good thing.

When you put it back together, just be sure to get it on a dyno.

This ^ at 8:5 to 1 an increase in CR wont harm the motor

Cheers

J.

[GTSBoy]

Piggaz advice is 100% valid. Put the valves in with some grease around the seats to make sure they seal. Get the clear part of a CD case and drill a 5mm hole in the middle. Slap that on the head face with a smear of grease to seal it. Set the head so it's nice and level. Use a burette or even a syringe to measure how much water you put in through the hole. Even with rough set up and equipment you'll be able to find out to within a fraction of a CC what the volume is. Job done.

[morto86]

What brand of gasket is recommended for an RB20DET

[Ben C34]

More info needed. But I would use a stock one.