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Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Thu Aug 18, 2022 4:10 pm
by cwodgers
Dragginwagon406 wrote: ↑Tue Dec 07, 2021 4:42 am
Nice running engine.
Looks to have a windage issue - you’re down 10 psi as the rpm climbs. I’m not familiar enough to say if it’s correctable on the long stroke small block, but it can’t be good.
What’s the bottom end and pan consist of? Any oil restrictors? Are the drains on these heads wide open?
Edit: a kick out style pan might help.
Do you plan on running a vacuum pump?
From what I have seen that is a pretty narrow range and could depend on the number of pulls and the oil. If it is break-in oil and pull 7 that would be a supprisingly good result.
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Thu Aug 18, 2022 7:56 pm
by ChopperScott
prairiehotrodder wrote: ↑Thu Aug 18, 2022 2:30 pm
How much difference was there on the dyno with the different carbs ? You said the 850 did the best ?
Thankyou
Brian
Here's a pull with the 950...
434 Dyno Run 7.JPG
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Fri Aug 19, 2022 8:03 am
by ptuomov
Awesome thread and results.
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Mon Aug 22, 2022 5:45 pm
by ChopperScott
Ran the car on Sunday at Atco Yesteryear Drags. It was losing traction after the hit, knocking the car out of the groove. 60' and ET were way off the mark. I need to get a camera on the suspension. The only change since running at Island was a carb swap with the XP850. Corrected mph is 133.343 on this run...
https://youtu.be/l6XQ3xkIDs4
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Mon Aug 22, 2022 10:02 pm
by ChopperScott
Rat Pack 1 was two cars in front of me in the same lane. It obviously wasn't a track issue...
Rat Pack 1 at Atco (1).jpeg
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Mon Aug 22, 2022 10:34 pm
by skinny z
ChopperScott wrote: ↑Mon Aug 22, 2022 10:02 pm
Rat Pack 1 was two cars in front of me in the same lane. It obviously wasn't a track issue...
Rat Pack 1 at Atco (1).jpeg
I hope he has a cupholder!
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Tue Aug 23, 2022 12:03 am
by BrazilianZ28Camaro
To the OP,
Keep an eye on the drop base filters systems, once I chassis dynoed a mild 358 SBC with a drop-base 3" tall x 14" OD paper element air filter and it was 23 WHP LOSS compared to no filter. Eye opener.
BTW, have you noticed any ET or MPH change with the hood on?
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Wed Aug 24, 2022 11:58 am
by ChopperScott
BrazilianZ28Camaro wrote: ↑Tue Aug 23, 2022 12:03 am
To the OP,
Keep an eye on the drop base filters systems, once I chassis dynoed a mild 358 SBC with a drop-base 3" tall x 14" OD paper element air filter and it was 23 WHP LOSS compared to no filter. Eye opener.
BTW, have you noticed any ET or MPH change with the hood on?
No argument here. My only other option is cutting a hole in the hood.
So far the quickest/fastest pass has been with the hood on.
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Wed Aug 24, 2022 12:05 pm
by skinny z
BrazilianZ28Camaro wrote: ↑Tue Aug 23, 2022 12:03 am
Keep an eye on the drop base filters systems, once I chassis dynoed a mild 358 SBC with a drop-base 3" tall x 14" OD paper element air filter and it was 23 WHP LOSS compared to no filter.
I understand that there can be issues with the filter case lid getting to close to the choke horn and that this can cause problems.
Apparently, the
shape of the base and lid has an effect as well.
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Fri Aug 26, 2022 12:23 am
by David Vizard
Your torque works out at 1.412 lbs/ft per cube which is good for an 11/1 CR.
What length collectors are you running on your headeers. I would think you need something in the 12 inch range.
DV
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Fri Aug 26, 2022 12:25 am
by David Vizard
Your torque works out at 1.412 lbs/ft per cube which is good for an 11/1 CR.
What length collectors are you running on your headeers. I would think you need something in the 12 inch range.
DV
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Fri Aug 26, 2022 3:47 pm
by BrazilianZ28Camaro
ChopperScott wrote: ↑Wed Aug 24, 2022 11:58 am
No argument here. My only other option is cutting a hole in the hood.
So far the quickest/fastest pass has been with the hood on.
Getting cold air from the outside would be nice, probably worth some ET.
I'd spect a big change in MPH with the hood on. Aero drag is a big factor at the big end.
Good luck, keep us posted!
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Fri Aug 26, 2022 6:52 pm
by ChopperScott
David Vizard wrote: ↑Fri Aug 26, 2022 12:25 am
Your torque works out at 1.412 lbs/ft per cube which is good for an 11/1 CR.
What length collectors are you running on your headers. I would think you need something in the 12 inch range.
DV
Hello there. Welcome back.
The headers have 1.875" x 29" primaries, 3.5" x 10" collectors, and 3.5" x 12" slip-on collector extensions w/turndowns.
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Fri Aug 26, 2022 8:24 pm
by Tom68
skinny z wrote: ↑Wed Aug 24, 2022 12:05 pm
BrazilianZ28Camaro wrote: ↑Tue Aug 23, 2022 12:03 am
Keep an eye on the drop base filters systems, once I chassis dynoed a mild 358 SBC with a drop-base 3" tall x 14" OD paper element air filter and it was 23 WHP LOSS compared to no filter.
I understand that there can be issues with the filter case lid getting to close to the choke horn and that this can cause problems.
Apparently, the
shape of the base and lid has an effect as well.
Yer 3" is a low filter for a drop base, 4" may have fixed it.
Re: Dyno tuned 434 SBC 11:1 AFR 245 Solid Roller
Posted: Fri Aug 26, 2022 10:32 pm
by BrazilianZ28Camaro
Tom68 wrote: ↑Fri Aug 26, 2022 8:24 pm
Yer 3" is a low filter for a drop base, 4" may have fixed it.
Probably would help, but wouldn't fit under the hood, unfortunatelly.