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Re: [Fot] 89 mm liners in a street TR4

To: "Tim Murphy" <timmurph@fastbytes.com>
Subject: Re: [Fot] 89 mm liners in a street TR4
From: Bill Babcock <billb@bnj.com>
Date: Fri, 12 Feb 2010 19:49:37 -1000
There's lots of unleaded race gas, not illegal to add it, and it gives a lot
bigger octane boost than the math says it would. Someone told me why once, but
I forget.

That said, I'd go for displacement and low compression--cheapest way to power.
Higher compression stresses everything. Keep it simple, a mild cam so all your
gas doesn't go out the exhaust, big pistons, and blueprint everything and
you'll have a great motor. Definitely get the crank nitrided. I'll probably
use Mikuni Solex carbs because I have a set.

All you really need to do for the ports is match everything up and clean off
the really rough spots. Don't get carried away, unless you have a flow bench
and know how to use it to gain flow, you WON'T improve anything.

I have a TR3 "kit" in my shop that I need to build. I'll be doing it exactly
that way. Nice chesty motor, good electrics, quaife rear end (I've already got
one), and a blueprinted stock gearbox with overdrive (have that too). Do all
the suspension mods to make it handle, good brakes, and bob's yer uncle.


On Feb 12, 2010, at 7:24 PM, Tim Murphy wrote:

> Thanks for all of the input.  I'm still in the planning stages on this so
> will have to consider all the info.  I'm thinking, seeing as how we don't
> have unlimited funds to do everything, that we might get more bang for the
> buck with a lightened flywheel than a lot of head or porting work.
Reducing
> that stock inertia will have huge dividends in response and get more torque
> to the rear wheels instead of trying to get that thing rotating.  We are
> planning to at least clean all of the casting slag out of the head ports.
> The car is in storage right now in Mequon in my daughters garage (about 50
> miles south of me) and I'm not even sure which head and intake manifold it
> has on it, other than I'm sure it's stock.  Ryan is the second owner and
> bought the car from my late friend Art Last before he passed away.  That
was
> about 10 years ago.  And I know Art didn't do any serious engine work.  Are
> there big advantages to be had from using the "high port" head?  I think
> that's the one with the flat on the manifold side by #1.  It's what we have
> on the race car and I think we have another spare.  We've also got a spare
> "long runner" intake manifold as used on the race car.
>
>
>
> We really appreciate the info on compression ratio and octane.  Really
don't
> want the hassle of adding octane booster and there aren't any stations in
> our immediate area that sell race gas.  I don't even think it's illegal to
> put race gas in a car without a catalytic converter.  If I remember
> correctly, that's how the law was originally stated, that it was illegal to
> put leaded gas in a car with a catalyst.
>
>
>
> Thanks again.  Will continue to look for any further info from the Amici
and
> will post when I come up with a plan and see what the folks think.
>
>
>
> Tim
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