View Full Version : Spraying with high compression??


smokin2002
01-27-2007, 07:41 AM
ok ive been building up a 13:1 compression 496 with plans of spraying it big with a direct port. Ive been hearing 2 diff things, high compression likes n20 and that it doesnt!? Just trying to straighten this out before i go any further. im considering a piston swap already before i get my heads. I have SRP 43cc domed pistons now. any advice i would appreciate. any head gasket recomendation?? Ive had my eye on the fel pro MLS.

mrdragster1970
01-27-2007, 11:56 AM
15.8-1 no problems with a 500+ hit.

We just did a thread on this exact subject.

jmm98LS1
01-27-2007, 04:41 PM
^^^^:werd: Nitrous looooooves compression!

smokin2002
01-28-2007, 01:43 AM
good deal, ill keep my same parts and ill hit it big with a direct port :drive:

DRVETTE
01-28-2007, 09:25 AM
Im in the proccess of building a large cube SB and i contacted shannon jenkins shop SPEEDTECH and they informed me that alot of compression is not ideal for LARGE nitrous shots. My plan was to put together a 14.1 motor then hit it with 2 stages of juice for a 600 shot total, and they told me that the more chamber volume you can get the better. They said i should shoot for a compression ratio of 12.1 no more that 13.1. The main reason i called them, well lets say his reputation in the nitrous world, stands alone. These are the top performers in NOS all out race cars.

smokin2002
01-28-2007, 01:15 PM
lol, here we go again!! Im only having a 13:1 ratio, the chamber volume does make sense, but then again like above ^ 15:1 with a 500 shot no problem.. :confused: and good work with the vette, :drive:

DRVETTE
01-28-2007, 05:15 PM
Believe me im with you on this one, the last motor combo i used had, 15.1 and sprayed up to 300 and had zero problems and ran that motor for 5 yrears. But now im in with a new motor build and, i was directed to these guys and that is the info they gave me. There not the only ones either to say that. I actually changed my plans on this motor build and bought new cyl heads to better fit my application. I was going to use the heads i already have, but they are 42cc chambers and on the bigger motor i wont be able to get the compression low enough. 13.1 should be fine, thats really not considered alot of compression these days.