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- Newsgroups: rec.autos.tech
- Path: sparky!uunet!cs.utexas.edu!convex!news.utdallas.edu!corpgate!crchh327!crchh435!ericy
- From: (Eric Youngblood)
- Subject: Re: Increasing power?
- Message-ID: <1992Jul27.170616.21276@bnr.ca>
- Sender: news@bnr.ca (News on crchh327)
- Nntp-Posting-Host: crchh435
- Reply-To: Peon w/o Email priv (Eric Youngblood)
- Organization: Bell-Northern Research, Richardson, Tx
- References: <1992Jul24.133816.20347@bnr.ca> <1992Jul24.183321.25371@kronos.arc.nasa.gov>
- Date: Mon, 27 Jul 1992 17:06:16 GMT
- Lines: 59
-
- In article <1992Jul24.183321.25371@kronos.arc.nasa.gov>, chucko@kronos.arc.nasa.gov (Chuck Fry) writes:
- |> 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?
-
- [some discussion deleted]
-
- |>
- |> All of the above sounds good for a "mild" hop-up, damn near no-hassle
- |> street motor. This motor should produce OK low end and dynamite
- |> midrange torque, and probably poop out around 5500 RPM or so.
-
- I setup the governor to shift at ~5000 rpm based on the piston speed for the
- Pont 400 engine. The stroke is 3.75" which works out to a piston speed around
- 2750 ft/sec at 5000 rpm. I have been told that with metals and bearings of this
- era it can handle up to 3500 ft/sec (works out to about 5600 rpm). Would I benefit
- by allowing more revs? (I was being conservative to prevent engine wear/damage)
-
- |>
- |> So how does it feel? Does it bog when the secondaries kick in, or is
- |> it one smooth rush of power from start to finish? Is there still
- |> power left when the trans shifts?
-
- The power output builds pretty evenly up through 3200 RPM and then it really
- begins so pull hard up to the shift at about 5000 rpm. The 1-2 shift breaks the
- rear end loose and it will get squirrelly on you if you are not paying attention.
- It feels like its still pulling strong when it shifts and gives you a good kick-in
- -the-pants. Also the 1-2 shift puts the rpm in the 3000 range for 2nd gear. Bottom
- line is pulls best above 3000 rpm.
-
- Street driving is a breeze and this idle is smooth enough to leave in gear at
- stoplights. Allthough you can *definitely* tell there's some addition cam in the
- engine. I would consider it streetable.
-
- |>
- |> >Traction is provided by Goodyear ST P235R15 radials. Track times
- |> >indicate an extreemly sluggish 60 foot times.
- |>
- |> Do you have problems getting traction? These tires aren't known for
- |> their ability to grip the 'strip. If you get serious about drag
- |> racing, get serious drag tires. You may need other traction remedies
- |> as well.
- |>
-
- Traction off the line NOT! I cant get near full throttle until about 5-10 mph,
- otherwise I'll just sit and spin. I will brake torque the drive train and then
- apply about half throttle until after 5mph and then full throttle.
-
-
- I appreciate everyone's comments,
-
- so far the most recommended change is to the rear-end ratio followed closely by
- alterations to the torque converter (higher stall) and tires (better traction).
-
- All of these could improve the numbers.
-
- Thanks,
-
- Ericy
-