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Will it work?
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Pruneman99
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PostPosted: Sun Jan 10, 2021 9:02 pm    Post subject: Re: Will it work? Reply with quote

buguy wrote:
Pruneman99 wrote:
I would guess you will have too high compression ratio with stock heads bored for 94's. Turbo will make the problem worse.


A quick check on the calculator shows 9:1 compression with a 53cc chamber,. 040" deck height, and a 94mm bore. Not bad. Make it .060" deck height and your down to 8.5:1 compression. That's not a terrible place for efi. Especially if you don't go nuts on the boost. Sure new heads would be better, but i wouldn't be afraid to run it like that on stockers for cheap money.


The head chart says 47cc chamber, but also a step. I don't know if the step was factored into the chamber volume, but I thought it was. The OP needs to verify what he actually has for chamber volume.
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modok
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PostPosted: Sun Jan 10, 2021 9:20 pm    Post subject: Re: Will it work? Reply with quote

47 not including step
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clonebug
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PostPosted: Sun Jan 10, 2021 9:20 pm    Post subject: Re: Will it work? Reply with quote

Run .100 deck......you have the parts already. That will put you right at 8.8:1...if you can get 52 cc chambers.

Make sure you have a good tune......10 lbs boost.....12.0:1 afr on boost, max of 130 degree IAT's at 20-22 Degrees advance would be a great starting point.
Use Water injection or an intercooler ...or both to keep intake temps down.

Cooler IAT's allow more advance.
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Last edited by clonebug on Sun Jan 10, 2021 9:22 pm; edited 1 time in total
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buguy
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PostPosted: Sun Jan 10, 2021 9:21 pm    Post subject: Re: Will it work? Reply with quote

Could be? I believe my original heads measured out to 56cc's but i don't remember for sure now.
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allamaabroad
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PostPosted: Sun Jan 10, 2021 11:07 pm    Post subject: Re: Will it work? Reply with quote

buguy wrote:
allamaabroad wrote:
I'm building something very similar, 78.4 x 94, panchitos with CNC 68cc chambers, CB2288 (FK8), 1.4 rockers, TD04-13 turbo.

With stock heads cut to 94, at best you'll have 52cc chambers, which means runing a massive deck height (.105") to get yourself to a useable compression ratio for a turbo.

I would second getting panchitos, the optional 68cc chamber is perfect for this motor as it gives a compression ratio of 8.2-1 with a .040 deck. With B pistons and 5.5 rods you should be perfect.


That will be a killer engine your building. You will be giggling like a schoolgirl when you get into the meat of that boost!!


I should be starting a build thread later this week, just about done with all the dirty work of fabrication so then I can get everything final cleaned and put together...Just waiting on a box from CB any time now
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madmike
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PostPosted: Mon Jan 11, 2021 4:41 am    Post subject: Re: Will it work? Reply with quote

Hey Lee, your gonna leave a lot of ponies on the bench using that 110 Wink
grab a fk8 and some 1:4's
I'm also in the middle of a 78 stroker build Cool but I opted for 92 thick walls Laughing
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mark tucker
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PostPosted: Mon Jan 11, 2021 12:05 pm    Post subject: Re: Will it work? Reply with quote

do some head work to chambers and ports,ss valves.the pan of Cheetos heads aint a bad idea. get them cnc chambers for the cr you wish it to be.personaly I would go with a lower lift cam&1.34 rockers to save on guide & seat wear.
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