How much boost on CNG?

[IBHomer]

Building a B18C1 and swapping in standard cams instead of VTEC. Plan on running on injected CNG (EFI). Question is, since CNG has 126 octane and needs lots of compression to work, what combination of compression and boost would be the limit on an all out 1/4 miler in a 95 Civic that is gutted to 1800 lbs. I am doing CNG because I teach Alt Fuels at Long Beach City College and this is a student project that must use an Alt Fuel. CNG is free to us and I need to make it work to prove a point. Any posts at all would help ( I hope).

Pete Sparks
Long Beach City College
Advanced Trasportation & Technology
psparks@lbcc.edu
(562)938-3005

[dug]

Originally posted by IBHomer
swapping in standard cams instead of VTEC.

hmm.. it's a little more involved than just cams

[IBHomer]

I realize that the cams are only a small part of the picture, I just want a feel for where to start when deciding on a bottom end kit. Is 11:1 too much to run 40-50 lbs. boost using CNG. I know it wouldn't work on pump gas but CNG won't detonate easilly and needs gobs of pressure and timing to work. I want this puppy to produce 700-800 hp and I KNOW the bottom end has got to be bullet-proof to do it. I plan on injecting the CNG using either a MoTec or a HalTech controller to batch inject it. I want to stay under 2.0L with the rebuild and don't want to stroke it any bigger. My local go-fast Honda machine shop is going to put in moly sleeves and extend them out the top about .003-.004" to seal the head nice and tight. Should I use a cable clutch or a hydraulic? I want to put a multi-disc setup in there after having the tranny beefed with straight cut gears and no synchros. What final drive ratio would be best? Are spools easy to come by?