No wonder those engines sound like they're always screaming!
Gary
-----Original Message-----
From: fot-bounces+vintage.racer=comcast.net@autox.team.net
[mailto:fot-bounces+vintage.racer=comcast.net@autox.team.net] On Behalf Of
Bill Babcock
Sent: Tuesday, June 10, 2008 8:32 AM
To: David Talbott
Cc: fot@autox.team.net
Subject: Re: [Fot] Finding TDC
One of the reasons I always liked two strokes--suck and squeeze
happens at the same time, the challenging part is that so do bang and
blow.
On Jun 9, 2008, at 4:25 PM, David Talbott wrote:
> Jesus, Mark, you need to be more careful when you talk about this
> suckin',
> squeezin', bangin', and blowin' stuff in a semi-public forum. You
> take that
> to the extreme, like a recent V10 F1 engine at close to 20,000
> RPM's, and
> that's enough of the aforementioned activity in a single minute to
> get a
> feller all worked up. All you need now is for Babcock to chime in
> on the
> two stroke equivalents of this and some of our senior correspondents
> like
> ol' Damndinger could literally pop a danged gasket.
>
> DT
>
> ----- Original Message -----
> From: "Mark J Bradakis" <mark@bradakis.com>
> To: <fot@autox.team.net>
> Sent: Sunday, June 08, 2008 8:25 PM
> Subject: Re: [Fot] Finding TDC
>
>
>>> 2) Rotate the engine 360 degrees, this is approximately TDC.
>>>
>>>
>> What, exactly, is the purpose of this step? Rotating the crank 360
>> degrees
>> will put it exactly where it was. If you want to check the
>> distributor
>> position
>> to see if the rotor is about where it should be when #1 is at TDC
>> ready to
>> fire just turn the crank until the valves for #4 are "on the rock"
>> instead of
>> the number 1 cylinder.
>>
>> In the four cycle suck, squeeze, bang and blow process TDC in a
>> cylinder
>> occurs between squeeze and bang, and again between blow and suck.
>> The
>> blow /suck TDC is when the valves for that cylinder are on the
>> rock, given
>> a basic, symmetrical cam grind.
>>
>> The length of the bolt or nut whatever you firmly attach doesn't
>> matter,
>> though the shorter the better to prevent deflection. Wherever the
>> two
>> marks for the clockwise and counterclockwise rotations end up, TDC is
>> halfway between the two.
>>
>> mjb.
>>
>> PS: The wedding in Irvine wasn't too bad, back in Salt Lake, lots of
>> email, Team.Net admin stuff, etc. to catch up on.
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Bill Babcock
Babcock & Jenkins
Billb@bnj.com
503.936.7660
www.bnj.com
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