Piston to head clearance ?
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Piston to head clearance ?
What is the minimum piston to head clearance with a Scatt I beam Rod and J&E flat top piston ? Plan on turning this thing about 7000 rpm may see 7200 . Scatt crank no NOS. Thanks Whitey
whitefield- Posts : 2244
Join date : 2009-08-23
Age : 56
Re: Piston to head clearance ?
On a steel rod with a JE ( I was there 14 years) I consider .035 the minimum and I prefer .040. .050 on an aluminum rod unless the block is aluminum too.
I should add "however you get it" . Thanks to Cometic there are various thickness gasket available in case the piston is "out" of the block . Saves cutting piston decks , etc.
I should add "however you get it" . Thanks to Cometic there are various thickness gasket available in case the piston is "out" of the block . Saves cutting piston decks , etc.
Last edited by gt350hr on June 3rd 2016, 4:38 pm; edited 1 time in total
gt350hr- Posts : 662
Join date : 2014-08-20
Location : Anaheim , CA
Re: Piston to head clearance ?
And your head gasket is .040 anyway at least so deck that boitch and get on with it! lol
away- Posts : 266
Join date : 2009-10-08
Age : 46
Location : Harrodsburg KY
Re: Piston to head clearance ?
Standard Felpro gasket is .041 thick compressed.
IDT-572- BBF CONTRIBUTOR
- Posts : 4628
Join date : 2008-12-02
Age : 63
Location : Shelbyville Tn.
Re: Piston to head clearance ?
.020 out of the hole !
Last edited by whitefield on June 5th 2016, 1:15 am; edited 1 time in total
whitefield- Posts : 2244
Join date : 2009-08-23
Age : 56
Re: Piston to head clearance ?
whitefield wrote:What is the minimum piston to head clearance with a Scatt I beam Rod and J&E flat top piston ? Plan on turning this thing about 7000 rpm may see 7200 . Scatt crank no NOS. Thanks Whitey
To be honest ... the closest you can get it without making actual contact is best ... every bore size and piston skirt combination will however, be different.
Re: Piston to head clearance ?
rmcomprandy wrote:whitefield wrote:What is the minimum piston to head clearance with a Scatt I beam Rod and J&E flat top piston ? Plan on turning this thing about 7000 rpm may see 7200 . Scatt crank no NOS. Thanks Whitey
To be honest ... the closest you can get it without making actual contact is best ... every bore size and piston skirt combination will however, be different.
Randy What do you think about running a .062 thick gasket versus the .041 ? The .062 would get me to what the specs for a steel connecting rods. (.040) Also what are your thoughts on COMETIC head gaskets are ? Thanks Whitey
whitefield- Posts : 2244
Join date : 2009-08-23
Age : 56
Re: Piston to head clearance ?
whitefield wrote:rmcomprandy wrote:whitefield wrote:What is the minimum piston to head clearance with a Scatt I beam Rod and J&E flat top piston ? Plan on turning this thing about 7000 rpm may see 7200 . Scatt crank no NOS. Thanks Whitey
To be honest ... the closest you can get it without making actual contact is best ... every bore size and piston skirt combination will however, be different.
Randy What do you think about running a .062 thick gasket versus the .041 ? The .062 would get me to what the specs for a steel connecting rods. (.040) Also what are your thoughts on COMETIC head gaskets are ? Thanks Whitey
With race fuel, a wide quench clearance won't make much difference at all.
With octane limited fuel, anything more than about .065" to .070" quench clearance will diminish most of the quench effectiveness.
Quench clearance doesn't really matter how you get it if the head gasket is strong enough to absorb the extra thickness.
For a big block Ford, Victor Reinz offers a big bore head gasket .051" thick, p/n 5973SC.
Re: Piston to head clearance ?
Cometics are awesome. .062 is fine on an iron head . Aluminum heads don't seem to care as much about quench.
gt350hr- Posts : 662
Join date : 2014-08-20
Location : Anaheim , CA
Re: Piston to head clearance ?
gt350hr wrote: Cometics are awesome. .062 is fine on an iron head . Aluminum heads don't seem to care as much about quench.
Iron block Aluminum heads is what I have. Thanks I am thinking about ordering a set .
whitefield- Posts : 2244
Join date : 2009-08-23
Age : 56
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