Let's Play - Predict the HP Game!

[TonyG]

OK... folks... it's "let's play the predict the HP game"

The prize for the person that guesses the closest peak hp SAE Corrected on a DynoJet Rear Wheel HP), without going over wins a full tank of gas on me! (22 gallons of pump gas... that is... at $2.75 per gallon paid to the winner ... round to $60.00US)

I will be dynoing this car on a DynoJet 248C chassis dyno next week and will be posting the dyno chart results.

'82 105k SC engine with the following mods:

1. Re-Ring K&S pistons with Aluisil Cylinders 9.3:1 compression
2. 24 new head studs/barrel nuts...
3. New valve springs, valve job, valve stem seals
4. New timing chains, timing chain guides, timing chain tensioners
5. New WebCam (not welded) 20/21 cams, new rocker shafts, new rockers, new elephant's foot adjusters and all hardware...
6. New Genuine SSI headers
7. New Custom 321 Stainless 2 in / 2 out muffler by "mb911 (Pelicanite Member)"
8. New 40mm PMO Carbs/PMO manifolds/PMO linkage, & 36mm Venturis
9. Rebuilt Euro Distributor, Vacuum Advance Removed, converted to full mechanical advance, and recurved by International Auto Electric
10. Stock 34mm '82 SC port dimensions, stock exhaust port dimensions - no cylinder porting
11. All new seals/gaskets along the way...


In short... this is a bone stock rebuilt '82 SC engine with PMO's, 20/21 Cams, SSI Headers, 2 in/2 out muffler, and a mechanical advance recurved distributor.

Basic stuff...


So... what's your guess? Post 'em here!

TonyG

[Porschekid962]

peak hp at the wheels i take it. i might be way off here but here goes, 231.6 rwhp

[TonyG]

Porschekid962

Just corrected my post... good eye..

The contest is for the closest to the peak Hp, SAE corrected, Rear Wheel HP, on a DynoJet.

Sorry.... slight oversight (can't belive I slipped up on this one... :-)

TonyG

[jluetjen]

What size venturi in the carbs???

[Carrera3.5L]

I'll take a stab at it and say 200 at the wheels. Hopefully you'll find more power though.

Ralph

[Glenn from Denv]

214

[rdane]

191

[TonyG]

jluetjen (and all)

...:::FURTHER DETAILS :::...



Venturi Size = 36mm


TonyG

[jgparker]

187

[1fastredsc]

210

[jluetjen]

hmmm....

My guess is...
* 203 HP at the crank
* 172 RWHP

[rdane]

John should that be 172.55

Here are some other dynojet numbers all taken the same day.

'79, mods are SSIs, Dansk 2 in and 2 out and a Webcam 20/21.
182 hp and 170# of torgue

'79, mods 1in/2 out Flowmaster.
168 hp and 162# of torque
177.1 hp and 161.8# of torque with SSIs

'81, mods SSIs with a OEM 2 in/ 1 out.
159 hp and 169# torque

'83, mods '73 OEM exhaust, Triad 2in and 2 out muffler and a Webcam 20/21 grind, 9.5:1 compression.
173hp and 174# of torque.

Start at 180/183 add 8 for the compression change and 5 for carbs and you are at 193/196...but I want t be under so 191

So far the best and most consistant numbers I have seen with the 20/21 or 964 cams have been 190/195 rwhp. Be fun to see how a carbed car does on the dyno.

Tony a question for you? Why the 20/21 cams with carbs?

[BURN-BROS]

189

[TonyG]

rdane

I hope the carbs are worth more than 5hp! :-)

I selected the 20/21 cams, after reviewing several dyno sheets, because they seemed to provide a very broad smooth power band in the rpm range supported by the 34mm port heads.

Also, I wanted a cam selection that Richard at PMO had previously setup his carbs for in order to get the carbs calibrated as easily (cheaply) as possible (it's a fortune going back and forth with 6 of everything...).

TonyG

[jluetjen]

Thanks rdane for the offer, but I think that I'll stand with the round number. Increasing the decimal places will just increase the chances that I'll go over.

It'll be interesting to see what the final numbers are and why. I'll reserve comment until then.

[rdane]

Thanks Tony. Knowing how the PMO's should be jetted is worth a bunch. Not telling you anything new, the 20/21 cams (I love the broad torque band of mine in both the old 3.0 and the new 3.4 CIS) will be the limiting factor in your new 3.0.

I am very interested in seeing where you car dynos out and the dyno sheets for the curves. Please keep us posted.
cheers,
Dane

[TonyG]

rdane

I'm limited by the piston-to-valve clearance issue of the stock pistons.

I think, and I'm not sure, that there are more agressive cams that will work with my stock pistons... but I figured I'd start out with the 20/21's, see how the thing dyno's out, then go from there depending on what the dyno chart looks like.

TonyG

[jluetjen]

Historically rdane and I have agreed to disagree on some things -- and this may be one of those times -- or not! It's also been recorded that on some things we're in violent agreement.

We'll see after the numbers get posted.

PS: Boy, it sounds like I'm talking about the election -- doesn't it!

[rdane]

Sorry Tony, I need to be more attentive to your build sheet. Didn't realize you reringed your OEM CIS pistons, of course that would limit your cam profile. In turn cams limit engine output.

For my engine the decision to stick with CIS outlined my engine build by limiting cam and then limiting my piston design. It would seem that by choosing to rering your CIS pistons you outlined your rebuild by doing that.

This was Superman's '83 that was reringed and CIS.

"83, mods '73 OEM exhaust, Triad 2in and 2 out muffler and a Webcam 20/21 grind, 9.5:1 compression.
173hp and 174# of torque."

BA (page 151) shows a 3.0 with 40 Webers, early exhaust and a stock muffler (on an engine dyno I assume) as 210hp and 200# of torque.

BA noted a 10hp for the addition of a set of carbs over a CIS system but that includes a cam profile to match.

"violent agreement"....that is a new one for me

I just enjoy keeping track of the different engine profiles and how people decided on what they built.

[Rob Channell]

I'll guess based on the size in cubic inches of the next size up factory motor. (3.2 Carrera -> 3.2 liter-> 192 cubic inches)

umm.....I'll guess 192 hp at the rear wheels.