ZL-1, what Hp do you think it will make

[EZ Nova]

So HOPING to make it to the dyno tomorrow with the 1969 "052" ZL-1, here are some specs:

- 1969 052 block, 100 over
- Eagle 4.00 stroke so 475 inches
- Eagle +.250 rods
- Je pistons
- .904 Comp roller lifters
- .715 .258 on .114 Comp cam
- trends pushrods
- 1969 074 heads ported with 2.25/1.94 valves
- Comp 1.7 roller rockers
- 1969 198 dual plane intake ported
- reworked Holley 830

So what's your guesses?????

[cook_dw]

Engine dyno Im assuming? What octane race fuel? What type of ignition?

Without knowing much about the actual build I would say that depending on how much head work that the heads would be the limiting factor aside from the carb.

This is all purely a guess on my part.

My guess is 709hp 684tq and I might be on the high side.. idk

[EZ Nova]

Pretty good amount of work on heads and intake. Will be aggressive pump gas/C12.

For dyno, just using my MSD dist and dyno has dig. 7

[VintageMusclecar]

Is this the same dyno that showed 730 lb.ft on that 468 you posted about back in February?

[EZ Nova]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: VintageMusclecar</div><div class="ubbcode-body">Is this the same dyno that showed 730 lb.ft on that 468 you posted about back in February? </div></div>

NO not the same dyno.

[EZ Nova]

Getting close!!!


http://i1285.photobucket.com/albums/a597/clawsie_machine/zl1/2_zpsr5aofz3i.jpg

[VintageMusclecar]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: EZ Nova</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: VintageMusclecar</div><div class="ubbcode-body">Is this the same dyno that showed 730 lb.ft on that 468 you posted about back in February? </div></div>

NO not the same dyno. </div></div>

WAG--800 HP.

Good luck! <<GRAEMLIN_URL>>/beers.gif

[earntaz]

Is it going in a flat bottom?? -- looks like the carb is back-asswards ... <<GRAEMLIN_URL>>/dunno.gif OR is that how the dyno needs to be setup ... TAZ

[EZ Nova]

Ok ran into some issues, some were ours, but mostly dyno. Fluctuating Hp numbers (by like 120+Hp between pulls), no changes just power dropped for some odd reason on a pull, and power going up and down significantly DURING a run. Other data seem to stay consistent like vac. both fuel consumptions, CFM and vol. efficiency.

We were thinking there is a issue with the water brake. All data has the indications of high 700's, low 800's (like his other dyno sheets with there info) just the actual numbers the dyno spit out were far less.

FYI we ran out of carb about 6600, Holley Hp1000 with 94's jets, and VE was constantly between 117 and 109. CFM is 359 THRU this dual plane intake! That was about 22 more then the 468 does the same style dual plane. And it made 713Tq and 709Hp

[EZ Nova]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: earntaz</div><div class="ubbcode-body">Is it going in a flat bottom?? -- looks like the carb is back-asswards ... <<GRAEMLIN_URL>>/dunno.gif OR is that how the dyno needs to be setup ... TAZ </div></div>

It was just set on there for moving to the dyno. We ended up using the shops Hp1000. Tried the 830 and ran out of carb real early.

[earntaz]

Copy that John -- thanks!

[EZ Nova]

Bit more info:
Made 626 with the Hp1000 at 5000 all the way to 7300? Just stayed with 10Hp, YET CFM consumption went up like 130, vac dropped to 1.1?? So how many have seen a dyno keep about the same Hp #'s over 2300 RPM?? Yet our CFM went up 130 CFM. This is where we think the dyno was having an issue.

Design of engine Hp should peak at 7000, tq about 5500.

We are looking at the 5000 RPM numbers to get an indication of where we are as well as the weather station info. Air in the room was 3660 ft elevation and 87 deg F when we made the pulls.

All indications are putting this in the 780Hp range TILL we get the bigger carb on it, or EFI. Looking at another high end chassis dyno in the fall to get this resolved.

all expectations was low 800Hp what we were hoping for.

Thanks

[firstgenaddict]

Because HP is a function of Torque and RPM - if the torque falls off at the same rate as the RPM increases then the HP will be flat.
Obviously no reason to keep twisting it if the Torque is falling off and the HP is flat - unless the shifts would drop the RPM's out of the fat part of the curve.

[EZ Nova]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: firstgenaddict</div><div class="ubbcode-body">Because HP is a function of Torque and RPM - if the torque falls off at the same rate as the RPM increases then the HP will be flat.
Obviously no reason to keep twisting it if the Torque is falling off and the HP is flat - unless the shifts would drop the RPM's out of the fat part of the curve. </div></div>

OK, IF that were true, HOW could the engine consume another 130+CFM of air, yet not make any more HP? Maxed out 979 CFM and a VE of 116?

Heard yesterday there were NO correction factors used on the dyno either? So that was with a room ambient temp at 92 deg, and elevations at 3500+ ft accourding to 2 different weather stations, dyno operators and our own.

So when these parameters we put into another local dyno shop's dyno info with the correction factors that have been well known to be very true, Hp came out at 776 at 6500RPM! Down a bit as were out of carb. should peak right about 7-7100 Rpm.

[firstgenaddict]

you are consuming more air because it is actually pumping more air IT has to pump more air as the RPM increases.

What are the flow rates on the intake and exhaust using a Flow bench?
say at .200 - .400 - .600?

[EZ Nova]

First gen, you right, these are just big air pumps really. BUT how can a PORTED sq port, BBc with 13-1 comp, 715 lift cam, 2.25 valve and 475 inches make &quot;about&quot; what a 1969 L-88 make with headers and a cam swap? Yet max out a Holley Hp1000 carb by 6600 RPM? Yet the other motor, with far less work and parts, made well over 700Hp

here are some numbers for you:

.200 .300 .400 .500 .600 .700 .800
int. 157 242 284 328 347 359 366

Exh. 130 169 196 227 258 261 268

Yes these heads are BETTER than BB2 PLUS with CNC option!

Those are THRU &quot;198&quot; intake with no pipe on exh port on Superflow SF-600 bench with a 4.350 fixture. We're &quot;trying&quot; something far different with these heads then what is considered normal! I would never have put the $$$ into these heads if it wasn't for the shop going good for ALL labour on this engine, I wouldn't have done it.

[EZ Nova]

Well, finally got it to a better dyno and with some better data. But I think we're at THE LIMITS of the block? Were down a bit of power! But all in all, I'm pretty satisfied with the results

[Scott69Z]

Where in Ontario do you get your work done? Always looking for a good engine shop.

Scott

[mockingbird812]

Stout - that should get you down the road!

[EZ Nova]

Where in Ontario do you get your work done? Always looking for a good engine shop.

Scott

Scott, at this time, I wouldn't want people to know where this came from for other issue right now. PLUS the machinist moved to Florida about a month ago. So I'm looking around too.