[Land-speed] Still Asking Motor Questions, lol..

[Dave Dahlgren]

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 at mayfco.com>
To: <land-speed at 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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