[slowbird]

Originally Posted by guidos

Well it was a interesting day as usual. I will try to keep this short.

As is set up, with tripower and 1 7/8 Dougs with header evacs (they are on my headers) it made a best of 590HP @ 5800 RPM and 618 Tq @ 4200RPM.

Put on the 2" Hooker super comps with no Header evacs and it lost about 5 HP and torque was down more.....didn't expect that! (more reasoning on this below)

Then we swapped the tripower for a Northwind, with a 1" open spacer: Still had the 2" headers on:

IT MADE 635 HP @ 6000 and 626 TQ @ 4700 RPM.

We then tried the 1 7/8 Dougs back on with no other changes,
it made 638 HP @ 6000 and 633 Tq @ 4700. (best of the Day)

So then we tried blocking the header evacs with no other changes, LOST 17HP!! Blow by was causing grief for sure.

SO the header difference might be due to no header evacs on the 2" headers. It would of been a good test to try them with header evacs, just didn't have the set up for it.

We also removed the 1" spacer and just ran the Northwind with no spacer and it lost 10 hp and 10 ftlbs across the board.

Didn't have enough time to try the other cam.... unfortunately.

I was surprised that the tripower wasn't higher....damit, 50 HP is alot to give up....might have to fabricate a tripower intake.

Do you have spacers under your tri-power carbs?
We made 750hp 2 6300rpm with ours and the only big difference is we have about 3.5 pts more compression, doubt that is worth 150hp. Keep working with the intake and carbs there is more there.

[grandville455]

Nice Numbers!, Was the northwind port matched to your heads? easy 10's now

Get a chance post the graphs for the northwind and the trips. what carb on the northwind?

[stickboy]

Very nice engine recipe there. What carb on the Northwind?

[guidos]

You know I should of asked more about the 4bbl, it was his "Dyno Holley" , I will have get some more info on it. I will post the graph tomorrow.

Slowbird, I do have 1/4" spacers... And I haven't given up yet!

[slowbird]

You might want to try taller spacers. The other thing is if you ever change the cam you might want to think about a tighter l/s (although your trans might like the wider l/s not sure about that), we have always ran a 106 to 108 l/s in ours.

[guidos]

Good to know, I wish we could of tried the other cam, would of been a good test. I will get some larger spacers for the next test!

[brut4s]

Wow great numbers! Hope you can find the lost horsepower

[Engo]

Originally Posted by Engo

If you replace the "tri-strictor" with a proper induction system it can make 700 with the bigger cam. And maybe 650 with the smaller cam.
If your "tri-strictor" intake/carbs are stock I say reduce the hp figures with 60-70 hp.

So it made 590 with tripower (my guess 590=650-60)
And 638 with a better intake (my guess 650)
How much do I win?

[mike leech]

nice job

[guidos]

Engo, you win the right to be right!! You pretty much nailed it!

[grandville455]

Rich, Do U have the cam card or the specs on your cam u are running now? Curious how it compares as far as the road paver I run in size,far as overlap etc, also what is the difference in flow from say your 340 Eldy head to a SD KRE 310 head? Does the Eldy flow 30 cfm more or is it the same cause of the design of each?

[guidos]

Here is some info on the cam and charts, the dotted line at the peak HP is 6000RPM. I think if we had some Header evacs on the 2" it would of made at least 10 HP more.

[Cliff R]

"I was surprised that the tripower wasn't higher....damit, 50 HP is alot to give up....might have to fabricate a tripower intake."

I'd be interested to see how much quicker the single plane intake runs at the track. Might not run all that much quicker, as dyno runs are only a snap-shot of the power curve. At the track the engine doesn't leave and stay in the upper rpm range where the better flowing intakes make more power. If it's only couple of tenths, I'd stick with the tri-power.

As far as headers go, we've seen 42hp difference from one brand to another on an engine making about the same power as yours. That's nearly the difference you saw in the intake manifolds. Same deal with spacers, not uncommon to see quite a bit of power lost if one isn't used with a single plane intake.....Cliff

[guidos]

Very interesting comments Cliff. I actually tried this manifold at the the track, with a different 1" spacer and a different carb, and the car was down a couple of mph and didn't ET as good. Now that was with a hydraulic roller cam and solid lifters.

Easy to get sucked into racing dyno's, but 11.17 @ 122 with the tripower still impressed me!

Thanks

[grandville455]

Originally Posted by guidos

Very interesting comments Cliff. I actually tried this manifold at the the track, with a different 1" spacer and a different carb, and the car was down a couple of mph and didn't ET as good. Now that was with a hydraulic roller cam and solid lifters.

Easy to get sucked into racing dyno's, but 11.17 @ 122 with the tripower still impressed me!

Thanks

Yeap, Exactly! Everyone gets hung up on dyno number's, the track loads the car totally different etc, my own car does not like timing on the track, every time i try more than 28 total it slows down! Was the same way in the grandville too, for some reason this motor doesn't want or need it. Rich was that the road paver u were running before than?

[Tom Vaught]

What work was done on the 66 Tri-Power?

Tom Vaught

[guidos]

Carbs have been modified (top section the piece that protrudes in to air horn was removed, and the throat was touched up a bit)
Intake is aluminum and was welded up to it had room for the taller ports, and the runners were all worked as material was added using JB weld. Where the two end carbs are mounted in the intake, the seperation between the two carbs was removed.....

Did you have some more ideas Tom?

[ponjohn]

Cliff-

I picked up 12/12 at the 450 hp level with a 1" spacer on an RPM.

[Cliff R]

"Easy to get sucked into racing dyno's, but 11.17 @ 122 with the tripower still impressed me!"

Like the stock spread bore intakes, you eventually hit a brick wall with them, but they will run. Jay Delaigle is in the 10's with a POS EGR version, and Rick Mahoney is just about in the 9's, and they do it with bias ply tires!......Cliff