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Old 10-09-2009, 05:28 PM   #1
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Default gsr vs itr crankshaft

hi
what is the differences between itr and gsr crankshaft?
itr crankshaft is better?

thanks
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Old 10-09-2009, 05:56 PM   #2
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Default Re: gsr vs itr crankshaft

ITR crankshaft is slightly heavier because of larger counter balancing weights. Better? Better for what?
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Old 10-09-2009, 07:52 PM   #3
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Default Re: gsr vs itr crankshaft

the extra weight adds more torque, not much though
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Old 10-09-2009, 08:22 PM   #4
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Default Re: gsr vs itr crankshaft

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Originally Posted by slo blue View Post
the extra weight adds more torque, not much though
i really want to hear the this be explained.

please, tell us how
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Old 10-09-2009, 08:27 PM   #5
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Default Re: gsr vs itr crankshaft

^^X2
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Old 10-09-2009, 08:36 PM   #6
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Default Re: gsr vs itr crankshaft

inertia
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Old 10-09-2009, 08:42 PM   #7
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Default Re: gsr vs itr crankshaft

Nope. A reduction in inertia can increase torque.
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Old 10-09-2009, 08:43 PM   #8
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Default Re: gsr vs itr crankshaft

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Originally Posted by mar778c View Post
Nope.
oh well, i tried to help a brother out lol.

More weight does not add torque btw.
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Old 10-09-2009, 08:45 PM   #9
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Default Re: gsr vs itr crankshaft

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Originally Posted by ALL M0T0R View Post
oh well, i tried to help a brother out lol.

More weight does not add torque btw.
Lol,

I love you dude.
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Old 10-09-2009, 08:46 PM   #10
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Default Re: gsr vs itr crankshaft

ITR crank is balanced to a higher rpm than the gsr for higher revving..

i guess it depends on your goals to say whether or not its better
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Old 10-09-2009, 08:50 PM   #11
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Default Re: gsr vs itr crankshaft

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Originally Posted by steveo135 View Post
ITR crank is balanced to a higher rpm than the gsr for higher revving..

i guess it depends on your goals to say whether or not its better
neither is really better then the other.. they are both good cranks.. doesn't matter which u use.
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Old 10-09-2009, 11:10 PM   #12
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Default Re: gsr vs itr crankshaft

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Originally Posted by steveo135 View Post
ITR crank is balanced to a higher rpm than the gsr for higher revving..

i guess it depends on your goals to say whether or not its better
Please explain how an ITR crank is balanced to a higher rpm vs. a GSR?
What RPM is a stock GSR crank good to?
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Old 10-10-2009, 10:55 AM   #13
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Default Re: gsr vs itr crankshaft

every part from a type r makes more torque
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Old 10-10-2009, 11:06 AM   #14
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Default Re: gsr vs itr crankshaft

If you want to make more tourqe use a LS crank in your gsr/type r block. A gsr crank has a 87mm stroke and a LS crank has 89mm stroke. All B series cranks will take high rpms. Its is the stock rods and rod bolts that cant take the super high RPMS.
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Old 10-10-2009, 11:45 AM   #15
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Default Re: gsr vs itr crankshaft

Quote:
Originally Posted by all-mtr-teg View Post
Please explain how an ITR crank is balanced to a higher rpm vs. a GSR?
What RPM is a stock GSR crank good to?
ok let me reword that...

The ITR crank is balanced to reduce vibration in higher rpm.. I've read it reduces vibration up to 20% i dont know what exactly that is compared to (gsr or ls)

as far as what rpm a gsr crank is good to.. i have no idea i guess you'd have to rev it till you break the crank or everything vibrates apart.. my guess is that you'd have problems with other parts handling the revs before the crank would have a problem...

i dont think you really cared to hear that answer though.. you probably just didnt understand what i was saying and were calling
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Old 10-10-2009, 12:33 PM   #16
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Default Re: gsr vs itr crankshaft

^^in that case why not buy a gsr crank for less than a type r and send it to a machine shop to be balanced and lightened?
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Old 10-10-2009, 02:02 PM   #17
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Default Re: gsr vs itr crankshaft

Quote:
Originally Posted by slowd16y8 View Post
^^in that case why not buy a gsr crank for less than a type r and send it to a machine shop to be balanced and lightened?
it'll probably end up costing a little more because im sure the balancing costs more than the difference between the two cranks... but it'l probably be a little better balanced
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Old 10-10-2009, 02:44 PM   #18
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Default Re: gsr vs itr crankshaft

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Originally Posted by slowd16y8 View Post
^^in that case why not buy a gsr crank for less than a type r and send it to a machine shop to be balanced and lightened?
Years ago when I was a noob I called JUN USA to ask about their motor building services

When I asked them if they knife edged cranks they said NO NO NO NO

They either kept stock weight or added a little to help with vibration/balancing at 10K+rpm

While knife edging will make the rotating assembly lighter and unlock a few ponies the trade off is the counter weights cannot counter the changes of direction as well

I would assumer the bearings will take on more load as revs rise and the counterweights get lightened too much

Maybe JUN was wrong, but I was inclined to think they knew what they were doing for longevity

A drag motor isnt going to see the extended high rpm sessions a road race motor will and JUN built more road race motors than they ever did drag (still built a 8 sec SR20 in 90's) so for street use I would keep the weights/add weight to compensate high rpm use and help the motor last longer even if it didnt unlock 2-5whp...

Of course light weight pistons/rods help offset the forces at 10-11K but you get the point
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Old 10-10-2009, 03:52 PM   #19
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Default Re: gsr vs itr crankshaft

Some days i just enjoy myself on here.
Bad information is worse than no information.
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Old 10-10-2009, 08:43 PM   #20
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Default Re: gsr vs itr crankshaft

Quote:
Originally Posted by DonF View Post
Some days i just enjoy myself on here.
Bad information is worse than no information.
100% agree
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Old 10-10-2009, 08:47 PM   #21
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Default Re: gsr vs itr crankshaft

Quote:
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Some days i just enjoy myself on here.
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Old 10-11-2009, 06:08 AM   #22
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Default Re: gsr vs itr crankshaft

thank you guys
so gsr crankshaft if was balanced can make more power than itr crankshaft?
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Old 10-11-2009, 06:22 AM   #23
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Default Re: gsr vs itr crankshaft

^^^there is an excellent chance this is possible.
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