[AT] Greg E, Gene D or anybody - VAC HP bump-up question.

[Easley, Greg]

Mine was making an honest 33hp with the overbore kit, lots of head work, carb work,
governor mods, G159 cam, etc. - pretty much anything that could be done short of
stroking the crankshaft.

The 207 will fit with a lot of work.  It bolts on in front, but it does not match the
VAC bellhousing.  The crankcase has to be re-drilled to make it fit. There's a lot more
than 34hp to be had from that one.

The G148 crankshaft will fit with minor machining and adds .25" stroke.

I'll have mine back together one of these days.  Waiting on the machine shop to finish
a stroker crank.  It will be 3.875"x5.125" (242cid) in the G124 crankcase.

It should be a nasty little beast when it's done.

Greg
http://www.casemanaugie.com


-----Original Message-----
From: at-bounces at lists.antique-tractor.com [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Gene Dotson
Sent: Monday, January 11, 2010 5:10 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Greg E, Gene D or anybody - VAC HP bump-up question.


    Farmer.
    The stock VAC engine does not respond very well to minor mods. The 
overbore pistons help some. The head is not a very free flowing design. 
Normally with stock bore and milling the head and cleaning up the valves and 
ports will get about 25 or 26 horsrpower.
    Most common engine for transplant is the 207 combine engine. They bolt 
up and are about 1 1/2 inches longer than the 124. Can get about 34 
horsepower with this engine.
    The VAC's from 1942 to 1948 had an engine built by continental, but is 
the same as the later engines and was a Case desige and contracted to 
Continental while Case was building their own tooling.
    Case used the Continental F124 flathead engine in the V series, V, VC VI 
and VO. They actually developed more power than the VAC. The VC I am working 
on now has been bored out to 166 cubic inches by usine .030  over F162 
pistons. The flathead Continental won't fit the VAC tractors and are not a 
stressed block, so require an exterior frame. I am expecting 30 gorsepower 
from my engine. Tested at Richwood and turned 27 with no tuning and a lazy 
governor.

                                                Gene



----- Original Message ----- 
From: "Indiana Robinson" <robinson46176 at gmail.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, January 10, 2010 7:41 PM
Subject: [AT] Greg E, Gene D or anybody - VAC HP bump-up question.


>I know that Greg pulls a VAC or two, does anyone else. I'm not looking
> to pull one but I would maybe enjoy pulling into a field at a plow day
> with a 2 - 14" pull type plow and rolling down the furrow at a good
> clip and at an obviously decent depth.
> What has anyone done to boost the HP on one of these by maybe a good 5 HP 
> or so?
> Is head milling a reasonable action on one of these. I would rather
> not replace pistons etc if not needed. It currently does not smoke or
> anything. Would porting and polishing give a boost? Maybe a larger
> carb? Maybe a split manifold and dual carbs? Dual exhaust? I wouldn't
> be overly considered about fuel consumption on a plow day and mods
> that were bolt-on could be un-bolted and it put back to stock... A
> head mill and bigger valves might  be do-able?
> -
> Has anyone ever done an engine substitution on one of these? Sitting
> here it popped into my head that I also have a second VAC here that is
> complete except for an engine. I suppose a GM 455 would be over-kill.
> I was thinking more along the lines of Gary Dotson's sharp looking
> "Kub"ota.
> ;-)
> I read that for the first few years they used Continental engines does
> that mean that a Continental would bolt up? Would anything a little
> bigger bolt up?
> Just trying to brain-storm a little. OK, maybe not a storm, just a
> sprinkle.  :-)
>
>
> -- 
> Have you hugged your horses today?
>
> Francis Robinson
> aka "farmer"
> Central Indiana USA
> robinson46176 at gmail.com
> _______________________________________________
> AT mailing list
> http://www.antique-tractor.com/mailman/listinfo/at 

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