Smaller rod journals in LS?

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May 18, 2018 | 07:25 PM

jhshnh

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Smaller rod journals in LS?

Has anyone used smaller rod journals in any LS build? I know this can get expensive, and probably not much return for the money, but it has to help in quick reving, high rpm, N/A applications.

May 20, 2018 | 10:28 PM

1FastBrick

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From: JunkYard

Expensive, Yes! I believe they use a 1.8 honda journal.

May 20, 2018 | 11:05 PM

garygnu

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would most of the hp gains be in better crank harmonics ,or higher rpms hp ?

May 21, 2018 | 12:04 AM

G Atsma

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From: Central Cal.

Through lower friction, so I would say increased power throughout the range, though the increase would be minimal.

May 21, 2018 | 03:38 AM

1FastBrick

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From: JunkYard

I wouldnt know for sure on the crank harmonics, but as mentioned reduces friction and lowers reciprocating weight. Every little bit helps for turning high RPM.

May 21, 2018 | 08:53 PM

jhshnh

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It's one of those things where you're leaving no stone unturned in your build. I would say if you're porting stock heads and using a hyd roller then you can't justify the expense of smaller journals.

But if you're using state of the art heads and intake along with a llsr, vacuum pump, lightweight drivetrain etc. then I would think this would go on the list to look at.

May 23, 2018 | 09:34 PM

KCS

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From: Conroe, TX

Callies will usually offer a 2” journal as an option for their cranks and rods. I’ve put togeter a bunch of engines with them.

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Jun 3, 2018 | 11:47 PM

1FastBrick

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From: JunkYard

Here you go.. one with honda journals in the classified section...

https://ls1tech.com/forums/parts-cla...rankshaft.html

Jun 4, 2018 | 09:21 AM

#10

pantera_efi

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From: Santa Ana, CA. USA

AL Main Caps = .001" MB

Hi All, the "Honda" LS crankshaft IS made for "class racing", one similar application is a "cup" engine specification.

The engine requirements ARE high RPM (9000+) AND LOW BMEP, thus no Turbos/SC/NOS.

The costs do do so is OVER 10,000 USD, the Billet Crankshaft@6K, the Billet Rods@3K, the .750" M-350 DLC pins@1K.

AL Main CAPS with "spacers" ???

I would STATE WHEN an AL billet main cap is fitted, the bearing Clearance MUST BE less than .001".

THEN there is the cost of the heads/valve train, I would fit the Mercury Racing FOUR Valve head conversion.

Lance