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Re: Sonic Injection
Posted: Mon Sep 13, 2021 9:09 am
by FJWALLY
Just curious but what is the general consensus as the best way forward for a warm grey in the bottom end once you've done new bearing and balanced crank etc.
Is there a benefit in the lightened condos that are going around? I see crank girdle may be overkill but would you go for billet bridges to replace the cast ones?
I'm having a new head put on the ute at the minute with some posing work etc but the bottom end is stock apart from the balancing and bearings when it was re-built.
Re: Sonic Injection
Posted: Mon Sep 13, 2021 9:35 am
by Harv
For a warm grey (not a thrashed one):
Standard rods are fine.
Bearing bridges only if you are going to wind the thing above 6300rpm routinely.
Drill dizzy oil hole for pre-EK (and some EK) blocks.
Replace rear main with third-party rope seal.
Drill crank end for harmonic puller.
Cheers,
Harv
Re: Sonic Injection
Posted: Mon Sep 13, 2021 5:43 pm
by FbSTDwagon
Harv wrote: Mon Sep 13, 2021 9:35 am
For a warm grey (not a thrashed one):
Standard rods are fine.
Bearing bridges only if you are going to wind the thing above 6300rpm routinely.
Drill dizzy oil hole for pre-EK (and some EK) blocks.
Replace rear main with third-party rope seal.
Drill crank end for harmonic puller.
Cheers,
Harv
That sounds like the plan I am putting together at the moment, with my own bearing bridges.
I’ll be hitting the machines to make some
Re: Sonic Injection
Posted: Mon Sep 13, 2021 6:11 pm
by Blacky
FbSTDwagon wrote: Mon Sep 13, 2021 5:43 pm
That sounds like the plan I am putting together at the moment, with my own bearing bridges.
I’ll be hitting the machines to make some
after seeing your bearing puller I guess that will be a walk in the park for you

Sonic Injection
Posted: Mon Sep 13, 2021 6:15 pm
by BS
Peter Grant who runs the other grey HAMB dragster in the class does not run any bearing bridges or girdles in his bottom end and he gives that thing a hiding. Yeah he’s snapped the odd crank here and there but you would not be driving a mild street car the way he drives that thing.
I had some bearing bridges in the engine In my hambster but that engine was from a salt racer that would be held wide open for extended periods of time. Once again not something you’d be doing in a mild street car.
When the time comes to freshen the donk in my wagon I’ll be pretty much following the recipe Harv has mentioned above.
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Re: Sonic Injection
Posted: Mon Sep 13, 2021 8:24 pm
by FJWALLY
Harv wrote:For a warm grey (not a thrashed one):
Standard rods are fine.
Bearing bridges only if you are going to wind the thing above 6300rpm routinely.
Drill dizzy oil hole for pre-EK (and some EK) blocks.
Replace rear main with third-party rope seal.
Drill crank end for harmonic puller.
Cheers,
Harv
The dynomotive guys are tipping 125hp after the head work - I wouldn’t have thought you could get that much with headwork alone but happy to be proven wrong
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Re: Sonic Injection
Posted: Mon Sep 13, 2021 9:35 pm
by Errol62
That's nearly 1 hp per cubic inch. B )
FB ute driver, EK van project