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Old 07-09-2004, 00:29   #1 (permalink)
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Some dyno figures

Put the new motor on the dyno today after around 900ks.

Specs:
Straight LPG, Impco 425.
Crank/Rods/Pistons: 351 crank, 302 rods /w ACL 10:1 comp pistons
Heads: 2v closed chamber heads, relieved to around 62cc, pocket ported with stock valves
Camshaft: GRA Stage 3 ( Approx .530 lift, more then they advertise ) Good for around 2000-5600rpm.
Intake: Redline Street Torker manifold
Exhaust: Pacemaker 4-1, dual 2 1/2"
Ignition: MSD HVC Coil & MSD leads. Pro Comp distributor with EFI Mustang pickup.
Milidon sump, pickup & windage tray.
Balanced

True compression i'm guessing around 11:1 ?

Had problems with the distributor, it was seized in the block so we couldn't get the timing right. Was set at 10 degrees static. The auto is on its last legs so I told the guy to take it easy.

Output was 225rwhp. The Dyno Dynamics chart has Lb on the right and HP on the left. The torque curve is very flat with 1100 Lb on the right and 145 on the left. Don't know if someone work out the torque from that, certainly doesn't have 1100 ft/lbs and I would think it would have more then 145?? Shrug.

Will need to fix the distributor and take it back once its done a few more k's.
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Old 07-09-2004, 18:18   #2 (permalink)
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Re: Some dyno figures

Would 145 be your KPH that they have sometimes instead of RPM?
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Old 07-09-2004, 19:10   #3 (permalink)
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Re: Some dyno figures

Quote:
Originally Posted by xespack
Would 145 be your KPH that they have sometimes instead of RPM?
More than likely yes.

Brenden
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Old 07-11-2004, 03:41   #4 (permalink)
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Re: Some dyno figures

Quote:
Originally Posted by wartide
Put the new motor on the dyno today after around 900ks.

Specs:
Straight LPG, Impco 425.
Crank/Rods/Pistons: 351 crank, 302 rods /w ACL 10:1 comp pistons
Heads: 2v closed chamber heads, relieved to around 62cc, pocket ported with stock valves
Camshaft: GRA Stage 3 ( Approx .530 lift, more then they advertise ) Good for around 2000-5600rpm.
Intake: Redline Street Torker manifold
Exhaust: Pacemaker 4-1, dual 2 1/2"
Ignition: MSD HVC Coil & MSD leads. Pro Comp distributor with EFI Mustang pickup.
Milidon sump, pickup & windage tray.
Balanced

True compression i'm guessing around 11:1 ?

Had problems with the distributor, it was seized in the block so we couldn't get the timing right. Was set at 10 degrees static. The auto is on its last legs so I told the guy to take it easy.

Output was 225rwhp. The Dyno Dynamics chart has Lb on the right and HP on the left. The torque curve is very flat with 1100 Lb on the right and 145 on the left. Don't know if someone work out the torque from that, certainly doesn't have 1100 ft/lbs and I would think it would have more then 145?? Shrug.

Will need to fix the distributor and take it back once its done a few more k's.

Wow,

My straight LPG 351 also made 170 RWK which is 227 Rear wheel horsepower.

I'm also using similar specs to you.

Impco 425
1 x B2 Converter
1/2 inch phenolic spacer
Redline streetTorker inlet
351 crank/rods
302 heads slightly ported with Y/T 1.73 adjustable bolt on rockers.
2V inlet valves 4V exhaust valves
ACL Dished Race series Pistons, Moly rings
9.5 : 1 comp
Comp Cams Valve springs
High Energy Extended sump
Genie Tri Y extractors into twin 2 1/4 zorst with manumatic mufflers.
( tail pipes from mufflers back are 2 inch press bent due to poor workmanship, I plan on changing this soon)
Crane Hi 6 Ignition and LX92 coil with regraphed Bosch Electronic Dizzy
8.5mm Magnecor KV85 Comp leads
Crane 272 .524 Intake .519 Exhaust 2000-5500 RPM
2200 - 2300 RPM stall in C10 trans
3.23 4 pinion LSD BW diff

I'll find my torque graph and get those details as well.

I think the limiting factor in our set ups is the IMPCO carb.
You may find that you won't get too much more Kw out of the motor.
I'm going to try a bigger converter to see if that helps any. ( ELKO E 420 )

Whole set up ran a 14.3 at Calder in an XE with street tyres and a little bit of wheelspin. ( As much as I could control it anyway.........this thing will spin for a 100 metres if I let it !!!!!!!!!! )

Looking at replacing the whole exhaust with mandrel bent system and x pipe.
2 1/4 all the way through with some good mufflers.
New Converter ( ELKO E 420 )
Muck around with IMPCO to de dag it and smooth out some roughage for better flow.

Hoping for 14.0 or even a 13.9 quarter..................fingers crossed
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Old 07-12-2004, 15:50   #5 (permalink)
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Re: Some dyno figures

wow, our motors being within 2hp of each other seems to prove that the impco in standard form certainly puts the brakes on around 300HP.

I'll upload my dyno chart, would be good to compare your torque.
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Old 07-13-2004, 05:02   #6 (permalink)
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Re: Some dyno figures

What converter are you using.

The B2 that I'm using is only rated to 300 HP from the motor.
I reckon this could also be a potential weak point.

I'm still looking for that bloody DYNO sheet...............................................
I've turned the house upside down looking for it
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Old 07-13-2004, 15:41   #7 (permalink)
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Re: Some dyno figures

Off the top of my head I think its the model L ..
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Old 07-13-2004, 20:26   #8 (permalink)
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Re: Some dyno figures

ESP: I'd want a dual 2 1/2" exhaust if i was you, I picked up a stack of top end power changing from tri-y's and a dual 2 1/4" to a set of 4-1's and a dual" 2 1/2 but i don't think I lost any doen low at all. No dyno sheets to back this up though... seat-o-pants meter only.

Wartide: Nice figures mate! Now for some 1/4 mile runs
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Old 07-13-2004, 22:47   #9 (permalink)
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Re: Some dyno figures

wartide:

Just out of interest, what dyno was that on?

Sounds like a good output clevo. Like xdc351 said, get some times down :)
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Old 07-14-2004, 08:02   #10 (permalink)
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Re: Some dyno figures

Quote:
Originally Posted by xdc351
ESP: I'd want a dual 2 1/2" exhaust if i was you, I picked up a stack of top end power changing from tri-y's and a dual 2 1/4" to a set of 4-1's and a dual" 2 1/2 but i don't think I lost any doen low at all. No dyno sheets to back this up though... seat-o-pants meter only.

Wartide: Nice figures mate! Now for some 1/4 mile runs
xdc351, did you change both at once or one at a time? If both, how do you know that the increase was from the extractors, larger diameter exhausts or both? There may not be much real advantage between a 2-1/2 versus a 2-1/4 tubes. I would think that most of the advantage you're feeling is from the difference in the extractors.

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