The engine you propose will ne very prone to detonation so basically a
ticking bomb. Bad idea. Squish is very important.
dave
----- Original Message -----
From: "Larry Mayfield" <drmayf@mayfco.com>
To: <land-speed@autox.team.net>
Sent: Saturday, March 12, 2011 1:19 PM
Subject: [Land-speed] Still Asking Motor Questions, lol..
> Not being known for motor building prowess, I rely on the list to help me
> along. Of late, I have been thinking about the use of a 289 Ford (what
> else?) crank in the Mexican cast block I will pick up in June. I would
> like to use the 302 Ford 5.090 rods rather than the hard to find 5.155 rod
> length of the old 289 series motors. And I want to consider the use the
> 302 version of pistons for the same reason as availability in race
> configurations. That puts the piston down hole by 0.065 inches, however.
> That would reduce the compression ratio quite a bit. But, I normally use
> dished pistons with about a 13 cc dish anyway. So if I use flat top
> pistors, I think I can maintain the basic compression ratio, but, the
> "squish" would go away. At least I think it would. I do run the turbo on
> the motor but What I would like to hear comments on doing this. Is this
> something stupid or actually reasonable to do on a boosted motor? Is it
> likely to run well or just so so?
>
> No, I don't want to deck the block or mill the heads or find pistons with
> a longer wrist pin compression height. I know I can do those things, so,
> the question is can I do it the way described above and have a good
> performer?
>
> So, you gotta ask..why? Well, I keep looking at the rule book about
> displacement verification using the pump. If the as pumped displacement
> is within 3% of top or bottom of the engine displacement class size then
> according to the book, it must be torn down for direct measurement.
> That's really the last thing I want to do. So if I can keep the motor size
> for a D motor to 289 - 296 cid range I should always pass a pump check and
> never have a tear down on the salt. Not that I am worried about it
> because I don't think me or the Sunbeam has the beans or aero to qualify
> or set a record but..just in case, lol. And maybe someone else will
> benefit from this question in some other situation.
>
> mayf
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