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TECHNICAL => ALL MOTOR TALK => Topic started by: Fastass99 on April 27, 2019, 06:54:40 PM

Title: Billet cranks on the street
Post by: Fastass99 on April 27, 2019, 06:54:40 PM

Has anyone used a 5 mil billet crank in a street/strip motor and had good results with it holding up? If so,what size motor did you build?

Title: Re: Billet cranks on the street
Post by: Fastass99 on April 30, 2019, 12:11:58 AM

I'm sure someone has used this crank. Any info would be helpful. Thanks

Title: Re: Billet cranks on the street
Post by: Fastass99 on May 03, 2019, 10:03:41 PM

Anyone?

Title: Re: Billet cranks on the street
Post by: Fastass99 on May 19, 2019, 09:20:09 PM

 I guess this is a guarded secret for the street racers. Lol

Title: Re: Billet cranks on the street
Post by: speedduck on May 20, 2019, 08:25:37 AM

This forum is dying, they dont upgrade the mile results anymore or anything, guys are old and given up hope.

But yes, 1507cc engine is very streetable , just dont go crazy with the compression ratio.

Title: Re: Billet cranks on the street
Post by: Fastass99 on May 20, 2019, 09:49:00 PM

Thanks for the. Information, Speedduck!

Title: Re: Billet cranks on the street
Post by: Nosgsx1300 on June 15, 2019, 03:59:23 AM

too much is it the compression?   or High compression causes detonation which beats the bearings?
WAAYYYY back in the early busa days   Stetson and DaveO built some stupid high CR 1507's   with weld up cranks

But yeah new billet cranks, with respectable CR and not Stupid cams     total blast on the street

I always wanted to try a 1507 with Stock cams and head     up to 8k it would be like my V-Max   :nutkick:

Title: Re: Billet cranks on the street
Post by: Ali123 on June 16, 2019, 01:44:54 PM

you ever build that 1397 motor with the turbo?

Title: Re: Billet cranks on the street
Post by: Nosgsx1300 on June 16, 2019, 03:16:26 PM

first 4 years turbo it was a 13.5-1 1397 that I spacer plated to 8.7-1     
WAY more down low   even with the OVERKILL HMP Head on it

then I wanted to turn it up more
AH that age old story of wanting more

Title: Re: Billet cranks on the street
Post by: Ali123 on June 17, 2019, 05:11:22 PM

I was wonderin… cause I thought u said u were takin the trip to DAS to the dyno... shipping is a pita though... I know/

Title: Re: Billet cranks on the street
Post by: knecum on July 16, 2019, 06:37:17 AM

 3.2543mm, 5, 6, 7, 8, 9, 10, 11 on the street not a problem problem.  I just have to build it.

Title: Re: Billet cranks on the street
Post by: Ali123 on July 16, 2019, 11:21:21 AM

Quote from: Ali123 on June 16, 2019, 01:44:54 PM

you ever build that 1397 motor with the turbo?

are u ever gonna get to a dyno? im curious how that old school 4088 does...

Title: Re: Billet cranks on the street
Post by: knecum on July 16, 2019, 02:41:06 PM

Quote from: Ali123 on July 16, 2019, 11:21:21 AM

Quote from: Ali123 on June 16, 2019, 01:44:54 PM

you ever build that 1397 motor with the turbo?

are u ever gonna get to a dyno? im curious how that old school 4088 does...

I built an 11mil.stroke 85mm bore offset turbo motor

Title: Re: Billet cranks on the street
Post by: Ali123 on July 18, 2019, 07:21:35 AM

That's the problem thlough…. u don't do much work these days do u?

Title: Re: Billet cranks on the street
Post by: Fastass99 on August 13, 2019, 09:34:38 PM

Do you. Have to run a spacer plate with a billet 5 mil stroke crank?

Title: Re: Billet cranks on the street
Post by: sportbikeryder on August 14, 2019, 11:29:15 AM

Quote from: Fastass99 on August 13, 2019, 09:34:38 PM

Do you. Have to run a spacer plate with a billet 5 mil stroke crank?

Of course not, there are always multiple ways to build an engine...

Title: Re: Billet cranks on the street
Post by: Fastass99 on August 15, 2019, 10:10:44 PM

Sportbikeryder, please do tell about the different build options.

Title: Re: Billet cranks on the street
Post by: sportbikeryder on August 15, 2019, 10:53:29 PM

Quote from: Fastass99 on August 15, 2019, 10:10:44 PM

Sportbikeryder, please do tell about the different build options.

The best possible option is to pay a reputable builder to build the engine. Steve Knecum pretty much can't be beat.

As for options other than using "spacers", most are more expensive, some ineffective..tall deck block,  shorter connecting rods, altered compression distance on the piston., just let the piston smack into the head, etc...

Title: Re: Billet cranks on the street
Post by: Fastass99 on August 18, 2019, 09:06:09 PM

Thanks, Sportbikeryder.

Title: Re: Billet cranks on the street
Post by: KZScott on October 20, 2019, 10:40:27 AM

we have put a couple 68mm cranks in turbo street bikes with good results.