How fast can I go with a n/a crank

[evil666]

I got a new motor built this year with a n/a crank ( none turbo) and would like some opions on how fast and reliable I could run with this crank. Opions from guys that run this crank or use to would be great.

This is my new set-up: T-Top 86 Grand Nationals 109 block with weisco forged pistons and 2 billet center main caps, M&A aluminum heads, roller rockers, port match lower intake ,te63 a.r .82, erson 214/214 cam, smc alky injection (95 % etanol), 25.5lbs boost, 94 octane, hooker cat back with dyno max ultra flow muffers, kenne bell headers, 60 lbs injectors, extender alky chip with 23/21 timing, with a gen 2 with a LS1 maf,thdp, mease 24 row IC, PTC 3200 stall 9 1/2 convertor, Ron Custom max boost brake module, MT drag radials (275/60/15) , rjc power plate, rjc boost controller, zeitronix wideband, HR motor mounts, Weld Drag Lites with skinnies up front, electric exhaust, hr rear sway bar, no front sway bar, 90/10 lakewood in the front and 50/50 lakewood shocks in the rear with energy suspension poly bushings all over, boxed rear lower control arms, Big mouth cold air with an AFE air filt

Thanks alot for your opions, it will be greatly apreciated.
Marco.

T-Top 86 Grand National 62000 km)
stock long block, stock suspension, 12 inch red stripe convertor (2800stall), te44, smc alk injection (95 % etanol), 25.5lbs boost,( boost spike 28 psi in 1st gear), 94 octane, hooker cat back with dyno max ultra flow muffers, 42 ½ lbs 009 injectors, turbotweak alky chip with 23/21 timing, thdp, mease 24 row IC, Ron Custom max boost brake module, MT drag radials (275/50/15) 3720lbs race weight with driver. (Torque convertor locked only after car shifted in third), rjc power plate, rjc boost controller, zeitronix wideband, HR motor mounts, comp cam 980 valve springs. Weld Drag Lites with skinnies up front, electric exhaust cut-out.
BEST E/T
60FT=1.53
1/8= 7.25
1/4= 11.48
MPH=120.82
BEST 60FT=1.52

I have a gen 2 with an extender chip and LS1 maf, hr rear sway bar, no front sway bar, 90/10 lakewood in the front and 50/50 lakewood shocks in the rear with energy suspension poly bushings all over, boxed rear lower control arms. MT 275/60/15 drag radials. Big mouth cold air with an AFE air filter. The times above were done with out these parts.

 

[evil666]

ttt

 

[bison]

You should be able to make 130mph passes. id be more concerned about the crank flexing and wearing the bearings than the crank actually failing.

 

[GNTIM]

I used to run a used motor with a N/A crank down to the low 7's in the 8th. Pulled it out and the crank guy said "it looked like a roadmap" Never again, it was one more pass from a big boom.

 

[evil666]

You should be able to make 130mph passes. id be more concerned about the crank flexing and wearing the bearings than the crank actually failing.

Well the reason I was asking this question is because I think I already have engine wear on my new motor, and it only has 650 km, (400 miles or so?). Didn't open it up yet but the car had a light knocking sound at about 3000 rpm and oil pressure was slowly dropping. Durring the summer the oil pressure was at 20 psi on a hot day and and warm motor. This september on a cold night but warm motor the oil pressure was at 13 psi. The other day I dumpped the oil and put a strainner, and found five little pieces of copper looking particles in the strainner. What is the difference between a turbo crank and a n/a crank that would cause the crank to flex? Is it the design, or is because it isn't made with the same material?

This is my new set-up: T-Top 86 Grand Nationals 109 block with weisco forged pistons and 2 billet center main caps, M&A aluminum heads, roller rockers, port match lower intake ,te63 a.r .82, erson 214/214 cam, smc alky injection (95 % etanol), 25.5lbs boost, 94 octane, hooker cat back with dyno max ultra flow muffers, kenne bell headers, 60 lbs injectors, extender alky chip with 23/21 timing, with a gen 2 with a LS1 maf,thdp, mease 24 row IC, PTC 3200 stall 9 1/2 convertor, Ron Custom max boost brake module, MT drag radials (275/60/15) , rjc power plate, rjc boost controller, zeitronix wideband, HR motor mounts, Weld Drag Lites with skinnies up front, electric exhaust, hr rear sway bar, no front sway bar, 90/10 lakewood in the front and 50/50 lakewood shocks in the rear with energy suspension poly bushings all over, boxed rear lower control arms, Big mouth cold air with an AFE air filt

Thanks alot for your help and opions,
Marco.

T-Top 86 Grand National 62000 km)
stock long block, stock suspension, 12 inch red stripe convertor (2800stall), te44, smc alk injection (95 % etanol), 25.5lbs boost,( boost spike 28 psi in 1st gear), 94 octane, hooker cat back with dyno max ultra flow muffers, 42 ½ lbs 009 injectors, turbotweak alky chip with 23/21 timing, thdp, mease 24 row IC, Ron Custom max boost brake module, MT drag radials (275/50/15) 3720lbs race weight with driver. (Torque convertor locked only after car shifted in third), rjc power plate, rjc boost controller, zeitronix wideband, HR motor mounts, comp cam 980 valve springs. Weld Drag Lites with skinnies up front, electric exhaust cut-out.
BEST E/T
60FT=1.53
1/8= 7.25
1/4= 11.48
MPH=120.82
BEST 60FT=1.52

I have a gen 2 with an extender chip and LS1 maf, hr rear sway bar, no front sway bar, 90/10 lakewood in the front and 50/50 lakewood shocks in the rear with energy suspension poly bushings all over, boxed rear lower control arms. MT 275/60/15 drag radials. Big mouth cold air with an AFE air filter. The times above were done with out these parts.

 

[bison]

Its time for a tear down on your current one. Somethings wrong. As far as flex goes they both are the same nodular iron casting and will flex the same. They are even the same casting #.

 

[evil666]

Its time for a tear down on your current one. Somethings wrong. As far as flex goes they both are the same nodular iron casting and will flex the same. They are even the same casting #.

Now I am a bit confused, if they are the same casting #, and made up of the same nodular iron casting, that means it is the same crank. So why do some people say not to put a n/a crank? Are the n/a cranks and turbo cranks forged?

This is my new set-up: T-Top 86 Grand Nationals 109 block with weisco forged pistons and 2 billet center main caps, M&A aluminum heads, roller rockers, port match lower intake ,te63 a.r .82, erson 214/214 cam, smc alky injection (95 % etanol), 25.5lbs boost, 94 octane, hooker cat back with dyno max ultra flow muffers, kenne bell headers, 60 lbs injectors, extender alky chip with 23/21 timing, with a gen 2 with a LS1 maf,thdp, mease 24 row IC, PTC 3200 stall 9 1/2 convertor, Ron Custom max boost brake module, MT drag radials (275/60/15) , rjc power plate, rjc boost controller, zeitronix wideband, HR motor mounts, Weld Drag Lites with skinnies up front, electric exhaust, hr rear sway bar, no front sway bar, 90/10 lakewood in the front and 50/50 lakewood shocks in the rear with energy suspension poly bushings all over, boxed rear lower control arms, Big mouth cold air with an AFE air filt

Thanks,
Marco.

T-Top 86 Grand National 62000 km)
stock long block, stock suspension, 12 inch red stripe convertor (2800stall), te44, smc alk injection (95 % etanol), 25.5lbs boost,( boost spike 28 psi in 1st gear), 94 octane, hooker cat back with dyno max ultra flow muffers, 42 ½ lbs 009 injectors, turbotweak alky chip with 23/21 timing, thdp, mease 24 row IC, Ron Custom max boost brake module, MT drag radials (275/50/15) 3720lbs race weight with driver. (Torque convertor locked only after car shifted in third), rjc power plate, rjc boost controller, zeitronix wideband, HR motor mounts, comp cam 980 valve springs. Weld Drag Lites with skinnies up front, electric exhaust cut-out.
BEST E/T
60FT=1.53
1/8= 7.25
1/4= 11.48
MPH=120.82
BEST 60FT=1.52

I have a gen 2 with an extender chip and LS1 maf, hr rear sway bar, no front sway bar, 90/10 lakewood in the front and 50/50 lakewood shocks in the rear with energy suspension poly bushings all over, boxed rear lower control arms. MT 275/60/15 drag radials. Big mouth cold air with an AFE air filter. The times above were done with out these parts.

 

[ijames]

Both cranks are cast from the same metal, and both have the fillets in the main journal rolled with a giant machine at GM. The turbo cranks and the cranks in the 4.1 motors also got the fillets in the rod journals rolled. This doesn't make them any stronger but it does greatly increase the number of cycles of flex before getting a fatigue failure. So you can go just as fast with a n/a crank as a turbo crank, you can just do it a lot more times with the turbo crank. How many is "a lot"? That's the question and there is no simple answer. If you have a problem after 500 miles it is very unlikely to be from a n/a crank unless it was cracked when it went in. I'd guess an oiling issue or maybe thrust hurting some bearings.

 

[evil666]

Both cranks are cast from the same metal, and both have the fillets in the main journal rolled with a giant machine at GM. The turbo cranks and the cranks in the 4.1 motors also got the fillets in the rod journals rolled. This doesn't make them any stronger but it does greatly increase the number of cycles of flex before getting a fatigue failure. So you can go just as fast with a n/a crank as a turbo crank, you can just do it a lot more times with the turbo crank. How many is "a lot"? That's the question and there is no simple answer. If you have a problem after 500 miles it is very unlikely to be from a n/a crank unless it was cracked when it went in. I'd guess an oiling issue or maybe thrust hurting some bearings.

So the only difference is the rolled fillets in the rod journals, which would make the turbo crank be able to take more abuse. Does the rolled fillets on the rod journals do anything to the way the rod bearings are lubricated with oil?

This is my new set-up: T-Top 86 Grand Nationals 109 block with weisco forged pistons and 2 billet center main caps, M&A aluminum heads, roller rockers, port match lower intake ,te63 a.r .82, erson 214/214 cam, smc alky injection (95 % etanol), 25.5lbs boost, 94 octane, hooker cat back with dyno max ultra flow muffers, kenne bell headers, 60 lbs injectors, extender alky chip with 23/21 timing, with a gen 2 with a LS1 maf,thdp, mease 24 row IC, PTC 3200 stall 9 1/2 convertor, Ron Custom max boost brake module, MT drag radials (275/60/15) , rjc power plate, rjc boost controller, zeitronix wideband, HR motor mounts, Weld Drag Lites with skinnies up front, electric exhaust, hr rear sway bar, no front sway bar, 90/10 lakewood in the front and 50/50 lakewood shocks in the rear with energy suspension poly bushings all over, boxed rear lower control arms, Big mouth cold air with an AFE air filt

Thanks,
Marco.

T-Top 86 Grand National 62000 km)
stock long block, stock suspension, 12 inch red stripe convertor (2800stall), te44, smc alk injection (95 % etanol), 25.5lbs boost,( boost spike 28 psi in 1st gear), 94 octane, hooker cat back with dyno max ultra flow muffers, 42 ½ lbs 009 injectors, turbotweak alky chip with 23/21 timing, thdp, mease 24 row IC, Ron Custom max boost brake module, MT drag radials (275/50/15) 3720lbs race weight with driver. (Torque convertor locked only after car shifted in third), rjc power plate, rjc boost controller, zeitronix wideband, HR motor mounts, comp cam 980 valve springs. Weld Drag Lites with skinnies up front, electric exhaust cut-out.
BEST E/T
60FT=1.53
1/8= 7.25
1/4= 11.48
MPH=120.82
BEST 60FT=1.52

I have a gen 2 with an extender chip and LS1 maf, hr rear sway bar, no front sway bar, 90/10 lakewood in the front and 50/50 lakewood shocks in the rear with energy suspension poly bushings all over, boxed rear lower control arms. MT 275/60/15 drag radials. Big mouth cold air with an AFE air filter. The times above were done with out these parts.