Re: Dyno #s for diy ported heads

From: Gary Hedlin (ghedlin@theramp.net)
Date: Wed Nov 27 2002 - 01:18:34 EST


yes, really :)

--
Gary Hedlin
"The Crazy Quadraplegic"
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""greg conner"" <dodgeboy93@hotmail.com> wrote in message news:F100hY8aUFLUH2s3Cfu000036bb@hotmail.com... > > oh really? ;) > > > > Greg Conner > 1996 RC > 3.9 hybrid > > > > > > >From: "Gary Hedlin" <ghedlin@theramp.net> > >Reply-To: dakota-truck@dakota-truck.net > >To: dakota-truck-moderator@bent.twistedbits.net > >Subject: Re: DML: Dyno #s for diy ported heads > >Date: Tue, 26 Nov 2002 23:53:28 -0600 > > > >14.313??? My V6 is gonna smoke that after the new engine!!! > > > >I'm glad to see ya do your porting yourself. Makes the rewards of your > >labor that much better!! Not many would tackle that feat! > > > > > >Gary Hedlin > >"The Crazy Quadraplegic" > >ghedlin@theramp.net (business) > >ragingquad@yahoo.com (personal) > >Webmaster For > >http://garyhedlin.com > >http://importslayer.com > >http://socaldakota.com > >http://scsilverdak.com > >http://assistivetechnologies.com > >...And Many More! > > > ><srp@cox.net> wrote in message > >news:20021127052232.QGAD2203.lakemtao02.cox.net@smtp.east.cox.net... > > > > > > I bet my cam would do you wonders... Sounds like my setup (but with 1.92 > >RT, nonported heads). I run the 4bbl m1 too. > > > > > > Sam > > > > > > > > > > > From: Bob Tom <tigers@bserv.com> > > > > Date: 2002/11/26 Tue PM 11:59:44 EST > > > > To: dakota-truck@dakota-truck.net > > > > Subject: DML: Dyno #s for diy ported heads > > > > > > > > > > > > For all you 1/4-milers, > > > > > > > > Last winter I ported my heads with the MP porting templates. > > > > My decision for going this route came down to money. > > > > > > > > My SAE corrected numbers with the stock heads: > > > > Peak HP: 226.1 @ 5000 > > > > Peak Torque: 257.2 @ 4500 > > > > > > > > My SAE corrected numbers with the ported heads: > > > > Peak HP: 241.7 @ 5750 > > > > Peak Torque: 254.1 @ 4250 > > > > > > > > Unfortunately, circumstances dictated that two dyno shops > > > > using different software and hardware were used so that > > > > comparing the numbers is not exactly like comparing > > > > apples to apples. Also, the printout that I got for the > > > > ported heads were for increments of 250 rpm and not > > > > the normal increments of 100 rpm for the stock heads. > > > > Nevertheless, it gives a close enough ballpark figure of what > > > > to expect. > > > > > > > > With my drivetrain loss, there was a gain of about 20 hp at > > > > the flywheel. I certainly was pleasantly surprised to see that > > > > the peak torque rpm had actually dropped a couple of hundreds > > > > of rpms. I also had expected the peak hp rpm to rise but not quite > > > > so high. > > > > > > > > As for track performance, weather and track conditions did not > > > > come close to those where I ran my bests last year. 14.313 @ 95.05. > > > > My best this year was 14.42 and I did up my trap speed to 95.92. > > > > At the end of Sept. this year, I began to experience intermittent > >bucking > > > > and misfiring in the high rpm range. Initial data indicated that the > > > > problem might be air-fuel related and I concentrated on this area. > > > > > > > > Last week, I discovered the problem was the cap and rotor. All the > > > > contacts were coated with a hard, thick, 'calcium-like' deposit. > > > > I have never seen a condition like this. Looked like it went through > > > > Jon's mud pit :-) > > > > > > > > Also, when the air temps. began hitting the 40Fs and below, I noticed > > > > that my coolant temp. was around 150F (city/highway) and barely > >cracking > > > > 160 at the track. The 180F tstat turned out to be partially stuck > >open > > > > and I was running quite rich. > > > > > > > > Just to show you how much the above problems affect performance, the > > > > dyno numbers with them are: > > > > Peak HP: 217.9 @ 5600 > > > > Peak Torque: 245.3 @ 4300 > > > > > > > > Next week I'll be replacing the RT cam with one that is closer match > > > > to my MPI 4bbl intake and ported heads. > > > > > > > > Have a great Thanksgiving, all you USAers. > > > > > > > > Bob, Burlington, Ontario. > > > > > > > > > > > > > > _________________________________________________________________ > MSN 8 with e-mail virus protection service: 2 months FREE* > http://join.msn.com/?page=features/virus >



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