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proper quench with 452 heads #289383 04/15/09 07:38 PM 04/15/09 07:38 PM
Joined: Oct 2008 Posts: 152 New York K Ken25 OP member
Ken25 OP member K Joined: Oct 2008 Posts: 152 New York	how would one get the proper and keep the compression around 9.5:1.what style pistons would be used,dome flat top or other. thanks

Re: proper quench with 452 heads [Re: Ken25] #289384 04/15/09 07:46 PM 04/15/09 07:46 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	step dome piston , like a KB , but what KB has will not get you that compression ratio easily once you equalize the chambetrs , it's going to take a CUSTOM piston , I'm having them made for a build I'm doing using 452's..

Re: proper quench with 452 heads [Re: JohnRR] #289385 04/15/09 07:51 PM 04/15/09 07:51 PM
Joined: Oct 2008 Posts: 152 New York K Ken25 OP member
Ken25 OP member K Joined: Oct 2008 Posts: 152 New York	just currious how high can you get the compression with out decking the block.

Re: proper quench with 452 heads [Re: JohnRR] #289386 04/15/09 07:51 PM 04/15/09 07:51 PM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	the kb184 will get you very close to 9.5. i have two engines with kb184's. one has 9.4:1 and the other 9.3:1 (these were checked by cc'ing heads and checking downfill). '452 heads usually have one deep chamber. after equalizing and milling 9.5:1 shouldn't be difficult to reach.

Re: proper quench with 452 heads [Re: lewtot184] #289387 04/15/09 07:56 PM 04/15/09 07:56 PM
Joined: Oct 2008 Posts: 152 New York K Ken25 OP member
Ken25 OP member K Joined: Oct 2008 Posts: 152 New York	o.k i have 440 h.p. pistons stock bore 452 heads with the shim gassket. what ratio would i have?

Re: proper quench with 452 heads [Re: Ken25] #289388 04/15/09 08:01 PM 04/15/09 08:01 PM
Joined: Jun 2008 Posts: 3,916 usa L lewtot184 master
lewtot184 master L Joined: Jun 2008 Posts: 3,916 usa	an hp piston could be anywhere from 9.5 to 10.5 with 88cc heads and steel shim gasket. measure the deck heigth and do some math. there are some piston variables.

Re: proper quench with 452 heads [Re: lewtot184] #289389 04/15/09 08:05 PM 04/15/09 08:05 PM
Joined: Oct 2008 Posts: 152 New York K Ken25 OP member
Ken25 OP member K Joined: Oct 2008 Posts: 152 New York	how do you calculate the cr?how does that compare to psi?

Re: proper quench with 452 heads [Re: lewtot184] #289390 04/15/09 08:33 PM 04/15/09 08:33 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	Quote: the kb184 will get you very close to 9.5. i have two engines with kb184's. one has 9.4:1 and the other 9.3:1 (these were checked by cc'ing heads and checking downfill). '452 heads usually have one deep chamber. after equalizing and milling 9.5:1 shouldn't be difficult to reach. That piston won't work for me , I had 2 deep chambers , to use that piston I'd have to cut about .060 off the heads using a steel shim gasket and still end up with the major part of the piston .090 in the hole, with a large valve relief which really isn't needed .

Re: proper quench with 452 heads [Re: Ken25] #289391 04/15/09 09:10 PM 04/15/09 09:10 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: how do you calculate the cr? http://kb-silvolite.com/calc.php? live every 24 hour block of time like it's your last day on earth

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