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- From: pshyvers@pyrnova.mis.pyramid.com (Peter Shyvers)
- Newsgroups: rec.autos.tech
- Subject: Re: Increasing power?
- Message-ID: <182809@pyramid.pyramid.com>
- Date: 25 Jul 92 05:12:46 GMT
- Sender: news@pyramid.pyramid.com
- Reply-To: pshyvers@pyrnova.pyramid.com (Peter Shyvers)
- Organization: Pyramid Technology Corp., Mountain View, CA
- Lines: 37
- Originator: daemon@sword.eng.pyramid.com
-
- In article <1992Jul24.133816.20347@bnr.ca> Peon w/o Email priv (Eric Youngblood) writes:
- >
- >Does anyone have any ideas on how to increase the power produced by a normally
- >aspirated V-8 engine?
- >
- >What I've got is a 77 TA w/ the Pontiac 400 cid engine. It was overhauled about
- >10k miles ago which included a mild performance street cam (intake .465 / 214 dur
- >@ .050, exhaust .480/224 dur @ .050). The heads had a "street-comp" port and valve
- >job (whatever street-comp is?). It has forged aluminum pistons and runs at 9.0:1
- >compression. The entire crank assembly has been balanced & bluprinted.
- >Its induction starts with the open scoop at the base of the windsheild through a
- >K&N cotton/wire mesh air filter, Holley 650 vac sec "emission" legal carb. It has
- >the original stock Pontiac manifold. The exhaust begins at 1-5/8" Hooker headers
- >w/ 3" collectors and includes a crossover pipe. The dual exhaust is 2-1/4" and
- >uses high flow mufflers.
- >The TH350 is driven by the stock 1200-1800 stall torque converter. The governor
- >is adjusted to provide WOT shifts at 5000 rpm. The power is transmitted to the
- >wheels through a GM-posi 10-bolt 3.07 differential. Traction is provided by
- >Goodyear ST P235R15 radials. Track times indicate an extreemly sluggish 60 foot
- >times in the 2 second range, 0-60mph is acheived in ~6.1 & 1/4 mile at ~14.5 secs.
- >
- >I would like to push the 0-60 time down into the high five second range and
- >hopefully reduce the 1/4 mile time into the low 14's is this possible or am
- >I about at the maximum for a "street" configuration.
- >
- >I still have the original 800 cfm Q-jet on the shelf in working order, it doesnt
- >get as good gas mileage as the Holley (currently 14mpg city/ 18 highway) but I
- >was wondering if the larger flow capacity would boost power? What about intake
- >manifold? Are there any that give good low rpm torque but allow better high rpm
- >breathing? Is there any evidence that synthetic motor oils can provide a small
- >increase in mechanical efficiency?
- >
- Aspiration is everything. Consider the intake manifold and carburator: if they
- are too small, all the rest is pointless.
-
- My own experience is that playing with the power curve is usually achieved
- via the cam and at the expense of pleasurable every-day driving.
-