[Land-speed] Compression Height, Ford Small Block, Of course...

Larry Mayfield drmayf at mayfco.com
Wed Mar 16 10:36:34 MST 2011


Yeah, that could be done. But lots of variables and parameters. Like rod 
material, piston material, ring drag on cylinder walls, piston speed, 
wrist pin weigh,  residual cylinder pressures, cam overlap, etc.  I did 
do some a bit of analysis  a number of years ago. Lemme look and see if 
any of that is adaptable. If I can find it..getting old...brain cells 
are dying by the car load, lol...

maybe a good thing...

mayf

On 3/16/2011 10:21 AM, Meierle, Michael D (Mike) wrote:
> Come on Doc, I was hoping for some mass in motion calculations...
>
> Mike Meierle
> Sr. Systems Engineer
> Alcatel-Lucent
> 7751 Windsor Drive
> Dublin, OH 43016
> (614) 284-6229
>
> -----Original Message-----
> From: land-speed-bounces at autox.team.net [mailto:land-speed-bounces at autox.team.net] On Behalf Of Larry Mayfield
> Sent: Wednesday, March 16, 2011 12:10 PM
> To: Neil Albaugh
> Cc: land-speed at autox.team.net
> Subject: Re: [Land-speed] Compression Height, Ford Small Block, Of course...
>
> Well, I don't think rod stretch in a turbo motor is an issue. That's
> because there is always residual pressure on the top of the piston. That
> prevents a majority of stretch IMHO, lol (my opinion being worth dog spit).
>
> mayf
>
> On 3/16/2011 10:00 AM, Neil Albaugh wrote:
>> Larry;
>>
>> You need enough clearance to allow for rod stretch at high RPM. That
>> said, I don't know what it should be!  :)
>>
>> Regards, Neil  Tucson, AZ
>>
>> --------------------------------------------------
>> From: "Larry Mayfield"<drmayf at mayfco.com>
>> Sent: Tuesday, March 15, 2011 9:27 PM
>> To:<land-speed at autox.team.net>
>> Subject: [Land-speed] Compression Height, Ford Small Block, Of course...
>>
>>> Last week I asked about mixing and matching the cranks, pistons and
>>> rods between a 289 and  302 sized motors. The use of the shorter 302
>>> rod with a 289 crank was not deemed to be a good idea because it puts
>>> the piston down hole 0.065 inches. Seemingly small but apparently
>>> important in squish. But when I look at a combo made for a particular
>>> engine, say the 289, virtually everyone of the piston makers use
>>> something other than the zero deck height  compression height of
>>> 1.6135 inches.  Most sell their pistons at 1.60 inches which also
>>> puts the piston down hole by 0.0135 inches.  Is that a significant
>>> amount?  I did sample  a number of products and one was 1.608 which
>>> is closer.
>>>
>>> What's good?
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