Good input!
Thanks,
mayf
On 3/12/2011 2:17 PM, Dave Dahlgren wrote:
> 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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