boost and compression

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dank10fenny

Post subject: boost and compression

PostPosted: Mon Apr 28, 2008 10:40 pm

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EFI Slant 6

Joined: Mon Nov 05, 2007 1:48 pm
Posts: 351
Location: PDX, OR
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just seein wut you turbo guys are runnin as far as compression.
my buddy like 240 nissans(booo) and wont shut up about turbo bla bla so it got me thinkin

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'72 Valiant DD for over a decade-225-Disc brakes, big T-bars, big Sway bars f/r, carter bbd/super six, GM HEI, 2- 12" subs in trunk, 1000w amp...
'77 cherokee cheif widetrack-360-33x12.5 tires-no lift. keeps driveway dry-project/backup DD/mudder

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Dart74

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PostPosted: Mon Apr 28, 2008 11:38 pm

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4 BBL ''Hyper-Pak''

Joined: Fri Nov 30, 2007 2:02 pm
Posts: 39
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CR will be determined by cam, combustion chamber design/piston design, what kind of fuel and how much boost. There is a huge difference in modern engine designs and these old engines. We run 10.5:1 CR in our race honda with 2.5kg boostpressure, it put out 512rwhp with 2L (stock) bottom end.

My slant will run at ~8:1 cr, but I'm sure the gurus at this great forum has more experience boosting a slant.

Note that with a high duratiing cam with big overlap your actual CR will be lower than the static.

Good luck,
Rob

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Rob,
Dart -74 4dht.