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LS / GSR crank, 5 main girdle questions

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Old May 1, 2006 | 05:56 PM
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Default LS / GSR crank, 5 main girdle questions

I am planning an ls/vtec build, but want to be sure I'm going to make the bottom end strong.

I'm planning a 5 main girdle and I know I need a GSR oil pan, but I read I need a pick up, as well. Can anyone tell me where this thing is, positionally, in the block? Between the girdle and the pan?

Also, I read that the ls crank is poorly balanced. Can I just toss a gsr crank in there, or are there some other bits I need to do that?

Sorry so many posts. Working up to a big build.
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Old May 1, 2006 | 10:01 PM
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The oil pickup and oil pan from a GSR is needed if you are running a girdle. It fits between the oil pan and girdle/windage tray assembly.

The LS crank will be fine. It has extra displacement that would be lost if a GSR crank was to replace it. Just replace the rod bolts with ARP studs and it should be plenty reliable up to 8k.
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Old May 1, 2006 | 11:57 PM
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if your switched to a gs-r crank u would lose that extra torque yet gain some reveability
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Old May 2, 2006 | 05:58 AM
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Great help, guys. Thanks. Here are a couple more related questions.

You think I'd be OK running the 3 main z10 instead of a 5 main? It'd really save me some scratch. I'm fairly worried about this crank flex idea now. Looking into the rod bolts, too.

Oh.. I was planning on doing this all while the block is still in the car. Do-able? I've done transmission and clutch work while in the driveway without issue, but never dropped the pan or anything like that.

Is there anything easy I can do to up viscosity for this setup? I've heard of inserting the gsr squirters, but that sounds crazy hard.
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Old May 8, 2006 | 07:33 AM
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I've been running an lsvtec set-up for about a year, there is really no need to to use the gsr oil pick up or pan!!! I would highly suggest using GSR crank and rod bearings for two reasons: ls,rs, and gs bearings were never ment to rev up to or past 8 grand! and second is that the GSR bearing will fit perfectly!! i ran my lsvtec for about two months before i shredded the bearings and had to replace them and the crank!!! this will allow to rev past 8 grand with the ls crank! do you know of everything that you are going to need to build an ls/vtec? what head are you using??

here the list of parts that i used and you WILL need!!

1. golden eagle ls/vtec conversion kit- includs (oil feed adapter and braided steel line, oil squirter plug which will block of the oil squirter, and arp gsr head studs, dowel pins, cosmetic head gasket) $350.00

2.Gsr rod bearing and crank bearings (all of them!!)
3.Gsr oil pump
4.gsr water pump
5.gsr timing belt (may want to go with a greddy timing belt, i just stretched the stock gsr timing belt!! and it was on for about 4000 miles)
6.gsr knock sensor!!! which will need a hole tapped into the block!!
7.a gsr ecu (i've seen several people build ls vtecs and they can't get them to work because they're using an Ls computer!!
8.get an LSD (Limited slip diff) I need to get one of these, power difference is big enough to the point where you're going to need it if you want to get the power to the ground!!!

you are going to need to either take the motor out or get another Ls block and build that!!

Have you been in an ls/vtec yet? the power difference is big even though your compression dips to about what a stock ls would be just slightly higher! this can be fixed by upgrading the pistons either with gsr, usdm type r, jdm Ctr or jdm type r pistons or go with after market pistons. Currently i'm building another ls/vtec block that will contain the jdm type r pistons, along with the current bolt ons that i already have! i've beaten stock and slightly modified rxs type S's repeatly and type R's.

Last edited by primetime; May 9, 2006 at 08:20 AM.
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Old May 9, 2006 | 08:07 AM
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ummm if u use a gs-r crank you will lose the extra stroke from the whole ls/vtec conversion, let me explain rreal brieflly torque is your force mulilyed by the lever arm, multiplyed by the sin of the angel inbetween the two. So the reason an ls engine has more torque is because the connecting rod connect farther out from the center of the crank shaft resulting in a bigger lever arm if u use a gs-r crank u will lose this longer lever arm and in effect u lose the extra torque and only gain some deck height
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