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PostPosted: Thu Dec 27, 2012 5:13 pm 
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dfree383 wrote:
IMO methanol is a PITA and not worth the effort if your looking to go fast.

To hot lap bracket race, yes its worth it.... other than that the stuff is useless.

You may have ring seal issues? you running injection or carb?


I use alcohol for many reasons.
My block is hard filled to the head studs.
I have no room for a cooling system.
I get the fuel for free.

I run twin carbs.
The block was plate honed when the new rings we fitted.


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PostPosted: Thu Dec 27, 2012 5:17 pm 
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blykins wrote:
You didn't see any increase whatsoever?

Brent,
My engine has never seen a dyno, so I can only go by time card and racepak.
No benifit seen anywhere which is very frustrating.
I am replacing the high port 4V's with AFD's next month so I can only hope the new piston / head
combo works better with the pump.


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PostPosted: Thu Dec 27, 2012 9:36 pm 
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Have you tried letting it suck a little harder?

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PostPosted: Fri Dec 28, 2012 9:51 pm 
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blykins wrote:
Have you tried letting it suck a little harder?


I tried it once with no relief valve and the BE bearings had black spots on them after 4 passes.
I fitted the Moroso relief valve and set it at 10 -12 psi because every racer forum I checked on said if I go higher I risk running the gudgeon pins dry.
The lower psi stopped the black spots on the bearings.
So who knows?


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PostPosted: Sat Dec 29, 2012 6:49 am 
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I'm thinking your rings are not working properly, might want to consider a different pack, different tensions or configurations.

Also look at your tune, its real easy to wash the walls down with alky.

Alky engines are generaly hell on rings and cylinder walls. IMO


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PostPosted: Sat Dec 29, 2012 8:13 am 
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I would expect the rings as well. Without a relief valve on the vacuum side, it will absolutely pull the oil off of the wrist pins and will starve the bearings if other precautions are not met. Going with 10-12 is a tad bit conservative though, IMO.

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PostPosted: Sat Dec 29, 2012 10:05 am 
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10-12 is about right for a wet sump and no special prep. I remember talking with Jon Kaase about it a few years back.


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PostPosted: Sat Dec 29, 2012 10:24 am 
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John would know. I've dyno'd some Boss 9 stuff at his shop, and had lunch with him, but I always feel weird about asking power-making questions around other engine builders....haha

I would feel comfortable with going up to about 15 inches, but something is amiss when there is not an ET change at all with a vac pump.

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PostPosted: Sat Dec 29, 2012 1:45 pm 
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I run a .031" dykes top ring, 1/16" zero gap second ring and the softest 1/8"oil ring that Total Seal make.
When I leaked it down b4 I put the pump on, I had no more than 1.5 -2% on any cylinder.


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PostPosted: Sat Dec 29, 2012 2:01 pm 
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A gapless 2nd?

I would run a Napier on the 2nd ring.

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