You can never watch enough engine assembly videos, you can always find a tip that will help. Retorqueing before the pan goes on was a good one, thanks.
Thanks for doing this for us Headflow. The IVCP @ .006" is 56 degrees ABDC. Our revised compression number is 10.1:1. Can you run it again and see what you get with these numbers please? Thanks always for your input and support for my channel. AG
I'm waiting to watch your entire series on the budget build before I start my rebuild. Great tips I've never seen before. Thank you for taking the time to share!
SCR calculation w/ 64cc head. Cylinders 8 Bore 4.004” Stroke 3.48” Head 64cc Valve relief cc 6.6cc Head Gasket .039” Fire ring 4.100” Deck height .025” (Below) SCR 9.53-1 *** I adjusted the fire ring to 4.100” but it could be 4.125” on the Felpro Perma-torq gaskets.
@@goldsgarage8236ou’ll need to do something to account for the pistons being .025” below deck if you want 10.0-1 compression. Yes a .015” head gasket can get it up to +- 10.09-1; But it’s not worth spending much money on because 1.66% difference in HP/TQ isn’t much.
A full number of compression ie 9.0-1 to 10.0-1 only account for +- 3-4% HP/TQ If we adjust the SCR from 9.52-1 to 10.0-1 or +-1.92% In your example 1.66% change. Adjusted SCR 10.0-1 ICL 104° 361hp @5000 rpm 461tq @2500 rpm Average 288hp 397tq ICL 108° 366hp @5000 rpm 453tq @2500 rpm Average 291hp 397tq
Thanks for doing the calculations and sharing all this information. We will be very pleased if we can make the great low end torque that you are predicting. AG
Very Good engine Assembly tips.....Something I do at This Assembly stage is to Carefully measure & Record crankshaft Only rotation Break-away FtLb Torque & Compare to Carefully installed #1 Piston & Rod Total crankshaft Rotation torque Increase.....Each Additional installed Piston & Rod assembly should Add identical Same FtLb crankshaft Rotation torque Incremental Increase as Each is Assembled if Rings installed Good Without hidden cracks.....
Rebuilding my l31 vortec but putting a carb and intake on with aluminum heads. Block is in good enough shape to stay with stock bore and rotating assembly with a quick dingle ball hone. But im kinda wanting to swap pistons out for some flat tops. Would I be ok without doing a complete rebalance with new pistons? If so ill probably just stick with stock D dish pistons but if it'll be ok without a balance ill change pistons, maybe add 150 shot then
Thanks JJ. If you have a gram scale you might compare the weight of the new pistons compared to the original ones. Unless there is a big difference or you will be operating at high RPM for and extended period, I wouldn't think you need to rebalance. AG
Авто/Мото
You can never watch enough engine assembly videos, you can always find a tip that will help. Retorqueing before the pan goes on was a good one, thanks.
Thanks Joe, glad it was helpful! AG
THE BEST EVER SERIES ON BUILDING A SHORT BLOCK!!!!! THANK YOU!!!
Very nice compliment Dave. That is what we are working for! Psychic income!
I’m running this build on my Desk Top Dyno 5 to compare.
Closing the intake valve ABDC 34° is creating pretty high cylinder pressure boosting Torque.
SCR 9.52-1
ICL 104°
355hp @5000 rpm
456tq @2500 rpm
Average 284hp 391tq
ICL 108°
360hp @5000 rpm
448tq @2500 rpm
Average 287hp 392tq
Simulation environment:
80 F, 50% humidity and 1000’ altitude
Average: 2000-6000 rpm
Thanks for doing this for us Headflow. The IVCP @ .006" is 56 degrees ABDC. Our revised compression number is 10.1:1. Can you run it again and see what you get with these numbers please?
Thanks always for your input and support for my channel. AG
🙏🏻 Thank you Allan … Extremely informative and educational video! 😉👍🏻
Thanks Jimmy! AG
I'm waiting to watch your entire series on the budget build before I start my rebuild. Great tips I've never seen before. Thank you for taking the time to share!
Thanks JR, glad you are finding it helpful, that is what we are working for. AG
Very helpful thank you😊
SCR calculation w/ 64cc head.
Cylinders 8
Bore 4.004”
Stroke 3.48”
Head 64cc
Valve relief cc 6.6cc
Head Gasket .039”
Fire ring 4.100”
Deck height .025” (Below)
SCR 9.53-1
*** I adjusted the fire ring to 4.100” but it could be 4.125” on the Felpro Perma-torq gaskets.
Thanks HeadFlow, we are using a steel head gasket, .015” I think.
@@goldsgarage8236ou’ll need to do something to account for the pistons being .025” below deck if you want 10.0-1 compression. Yes a .015” head gasket can get it up to +- 10.09-1; But it’s not worth spending much money on because 1.66% difference in HP/TQ isn’t much.
A full number of compression ie 9.0-1 to 10.0-1 only account for +- 3-4% HP/TQ
If we adjust the SCR from 9.52-1 to 10.0-1 or +-1.92%
In your example 1.66% change.
Adjusted SCR 10.0-1
ICL 104°
361hp @5000 rpm
461tq @2500 rpm
Average 288hp 397tq
ICL 108°
366hp @5000 rpm
453tq @2500 rpm
Average 291hp 397tq
Thanks for doing the calculations and sharing all this information. We will be very pleased if we can make the great low end torque that you are predicting. AG
Excellent Videos
Thanks for your comment Terry. Motivates me to keep going. AG
Very Good engine Assembly tips.....Something I do at This Assembly stage is to Carefully measure & Record crankshaft Only rotation Break-away FtLb Torque & Compare to Carefully installed #1 Piston & Rod Total crankshaft Rotation torque Increase.....Each Additional installed Piston & Rod assembly should Add identical Same FtLb crankshaft Rotation torque Incremental Increase as Each is Assembled if Rings installed Good Without hidden cracks.....
Also a good idea. I always rotate the crank after each piston but I don't usually measure torque after every piston. Attention to detail. AG
No support ring underneath the bottom scraper ring?
Perfect turbo motor with that ring gap
Thanks Trevor. For sure ring end gap will not be a problem. AG
1-1/4 hex socket will turn that crankshaft a little cheaper
Rebuilding my l31 vortec but putting a carb and intake on with aluminum heads. Block is in good enough shape to stay with stock bore and rotating assembly with a quick dingle ball hone. But im kinda wanting to swap pistons out for some flat tops. Would I be ok without doing a complete rebalance with new pistons? If so ill probably just stick with stock D dish pistons but if it'll be ok without a balance ill change pistons, maybe add 150 shot then
Thanks JJ. If you have a gram scale you might compare the weight of the new pistons compared to the original ones. Unless there is a big difference or you will be operating at high RPM for and extended period, I wouldn't think you need to rebalance. AG
@@goldsgarage8236 Thanks!
👍👍👍
Thanks Medium. AG
First!
Thanks for the compliment. AG