Dyno'ed my 68 tripower

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Aug 5, 2008 | 10:12 PM

howarsc

Thread Starter

Racer

Joined: Aug 2005

Posts: 347

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From: Pace FL

Dyno'ed my 68 tripower

My tripower put down 476rwhp/484rwtq SAE rear wheel #'s.
Factory intake, carbs, and factory aircleaner w/k&N.

Anyone else dynoed their cars?

Aug 5, 2008 | 11:06 PM

68L71

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Joined: Aug 2006

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From: Midwest

Nice

Aug 5, 2008 | 11:46 PM

73, Dark Blue 454

Melting Slicks

Joined: Mar 2005

Posts: 2,838

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From: Austin TX

On the motor? Also, what cam and heads?

Aug 6, 2008 | 12:14 AM

howarsc

Thread Starter

Racer

Joined: Aug 2005

Posts: 347

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From: Pace FL

Quote:

Originally Posted by 73, Dark Blue 454

On the motor? Also, what cam and heads?

yep all motor, all 93 octane.
ported procomp 320cc heads, 254/260 custom solid roller cam

Aug 6, 2008 | 09:57 AM

Vette79C3

Pro

Joined: Jul 2008

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From: Millersville, MD

Sswwweeeeeeeetttt!!!

Aug 6, 2008 | 09:59 AM

1Fordman

Drifting

Joined: Oct 2007

Posts: 1,317

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From: Marina CA

Impressive numbers, that 427 surely gets the job done!

Aug 6, 2008 | 10:13 AM

yel76low

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From: Hastings MN

Is that the pure reading? Or were any correction factors applied to get that number?

In any case, NICE!

Aug 6, 2008 | 12:01 PM

howarsc

Thread Starter

Racer

Joined: Aug 2005

Posts: 347

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From: Pace FL

Quote:

Originally Posted by yel76low

Is that the pure reading? Or were any correction factors applied to get that number?

In any case, NICE!

Thanks,
If you use the std. correction factor then it adds about 15hp and tq. these are pure numbers with smoothing that lowers them as well.

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Aug 6, 2008 | 12:05 PM

Les

Race Director

Joined: Dec 1999

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From: Sierra Foothills CA

It looks like those heads & that monster cam are really getting it done. Congrats on your numbers.

Sooooooo, how's your traction when you hit the loud pedal? I'll bet it's quite a ride.

Aug 6, 2008 | 05:51 PM

#10

carbster09

Burning Brakes

Joined: Oct 2002

Posts: 914

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From: Aberdeen, Scotland

what headers and exhaust?

nice numbers; tell us more about the engine. What headers and exhaust are you running? What about an MSD or did you keep the points?

Aug 6, 2008 | 07:25 PM

#11

howarsc

Thread Starter

Racer

Joined: Aug 2005

Posts: 347

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From: Pace FL

Quote:

Originally Posted by Les

It looks like those heads & that monster cam are really getting it done. Congrats on your numbers.

Sooooooo, how's your traction when you hit the loud pedal? I'll bet it's quite a ride.

Thanks. Roller cams act much tamer than flat tappets with the same 050 duration, lots less overlap. It will idle at 700-800rpm all day. My peak power was only at 6000rpm. I have a wide lobe sep to bring peak tq and power down but spread out the tq. There is over 400ft-lbs to the wheels from 3000-6300rpm.

It makes peak power below a factory L71 but pulls strong past 7000.
Traction is a problem in 1st, 2nd, and the top of 3rd. But I have bfg drag radials to fix that now. It does have a good tq pull.

Aug 6, 2008 | 07:27 PM

#12

howarsc

Thread Starter

Racer

Joined: Aug 2005

Posts: 347

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From: Pace FL

Quote:

Originally Posted by carbster09

nice numbers; tell us more about the engine. What headers and exhaust are you running? What about an MSD or did you keep the points?

MSD 6AL and MSD dist w/tach drive. Headman headers 2", pypes 2.5" exhaust w/x-pipe.

Aug 6, 2008 | 08:48 PM

#13

howarsc

Thread Starter

Racer

Joined: Aug 2005

Posts: 347

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From: Pace FL

The dip in the graph is the secondaries opening on the tripower.

Aug 7, 2008 | 12:54 PM

#14

427SB

Heel & Toe

Joined: Jun 2004

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From: Decatur AL

I was there at the dyno and will confirm that it was naturally aspirated. Not even a nitrous system on it. It is a 468 though and not a 427, 10.7:1.

Aug 7, 2008 | 06:16 PM

#15

Irish69427

Racer

Joined: Mar 2007

Posts: 278

Likes: 2

From: Wellington Florida

I am about to dyno my 496 tripower build. What did you jet the carburetion? What kind of lift on the cam? Were the procomps CNC ported or hand ported? I have a set of the CNC ported but have been reluctant to run them as the ports look huge. Debating whether to run an AFR 305/315 instead.

Aug 7, 2008 | 09:03 PM

#16

howarsc

Thread Starter

Racer

Joined: Aug 2005

Posts: 347

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From: Pace FL

Quote:

Originally Posted by Irish69427

I have .720 lift. The AFR's should flow better at low rpm. If you have under 250* at .050 then I would go with the 305's. If you have over 270* then use the CNC procomps. My procomps were hand ported to a gasket match as was the intake.

My carbs are straight up as factory. The primary is fine at cruise (14.5-15.0). The secondaries are 15ish at WOT with no air filter, but 13.5 w/ the air filter on. I could drill the secondaries for the winter and to run w/o and airfilter. That would give me ~10 more hp across the board. I need 2 -4 jet sizes larger.

Aug 7, 2008 | 11:32 PM

#17

73, Dark Blue 454

Melting Slicks

Joined: Mar 2005

Posts: 2,838

Likes: 10

From: Austin TX

I think it's cool you went with tri-power set up. Heck, paint the heads Chevy orange and you'd have quite a sleeper.

Aug 8, 2008 | 08:29 AM

#18

TheycallmeDave

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Joined: Nov 2007

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From: Northern Florida

Ill bet it was screaming at 7,000 rpms !

Aug 10, 2008 | 01:49 PM

#19

howarsc

Thread Starter

Racer

Joined: Aug 2005

Posts: 347

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From: Pace FL

My timingis still not optimized and I just adjusted my lash and most vales wereon .040" instead of .021". So there's a few more in it. I'll redo when it gets cooler.

Sep 26, 2008 | 11:11 PM

#20

howarsc

Thread Starter

Racer

Joined: Aug 2005

Posts: 347

Likes: 0

From: Pace FL

Went back to the dyno after a few tweaks. New SAE#'s are 488rwhp/490rwtq. I went a little rich on the seconday plates too. Std. correction was 501rwhp/502rwtq.

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