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Pruneman99
Samba Member
Joined: February 22, 2012
Posts: 5013
Location: Oceanside
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 Posted: Sun Jan 10, 2021 9:02 pm Post subject: Re: Will it work? |
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| 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
Samba Member
Joined: October 30, 2009
Posts: 27750
Location: Colorado Springs
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| Posted: Sun Jan 10, 2021 9:20 pm Post subject: Re: Will it work? |
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| 47 not including step |
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clonebug
Samba Member
Joined: January 29, 2005
Posts: 4130
Location: NW Washington
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| Posted: Sun Jan 10, 2021 9:20 pm Post subject: Re: Will it work? |
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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.
_________________
| richardcraineum wrote: |
| I'm so ignorant of efi I don't even know the difference between batch, sequential blah blah blah .. |
| cbeck wrote: |
| His user name in a previous life was dick head. |
My Megasquirt Fuel Injection Turbo Buggy Build
Water/Alcohol Injection
Audi TT intercooler
Upgraded to MS3Pro-Evo
EcuMaster PMU16
ECUMaster ADU5 Digital Dash
http://www.shoptalkforums.com/viewtopic.php?f=3&t=127936
Last edited by clonebug on Sun Jan 10, 2021 9:22 pm; edited 1 time in total |
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buguy
Samba Member
Joined: November 17, 2003
Posts: 4915
Location: Port Orange, FL
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| Posted: Sun Jan 10, 2021 9:21 pm Post subject: Re: Will it work? |
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| 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
Samba Member
Joined: September 22, 2016
Posts: 560
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| Posted: Sun Jan 10, 2021 11:07 pm Post subject: Re: Will it work? |
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| 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
Samba Member
Joined: July 11, 2005
Posts: 5300
Location: Atlanta,Michigan
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| Posted: Mon Jan 11, 2021 4:41 am Post subject: Re: Will it work? |
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Hey Lee, your gonna leave a lot of ponies on the bench using that 110 
grab a fk8 and some 1:4's
I'm also in the middle of a 78 stroker build  but I opted for 92 thick walls 
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23945
Location: SHALIMAR ,FLORIDA
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| Posted: Mon Jan 11, 2021 12:05 pm Post subject: Re: Will it work? |
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| 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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