Operating temps

[CSH-HQ]

At 09:03 AM 9/27/99 -0400, gmecm at efi332.eng.ohio-state.edu wrote:
>Not trying to get anybody all riled up.. Just looking at it from a
>machinist's point of view.  You may think there is no damage but what us,
>the machinist sees is a different story.  Hmm a connection?

Please continue on abut temps and the barrel grind to the piston skirt etc..
seems like lots 
 I've found folks haven't a clue aout  operatng temps, or acurate tesig
Grumpy
ftciblmachined, the deck is out 15-20  thousands of an inch out
>of flat and the seats are pounded in, ESP exhaust . You also see that the
>deck and cylinder walls tend to be out of flat and out of straight
>respectively.  I can guess within about 10 deg F how hot the engine has been
>run when it comes in for the 2nd rebuild. (That is if I had prev. rebuilt
>it, i.e. line honing decking boring planing the heads.  Not disagreeing that
>higher temp does not get more power. I agree that too low is bad too.
>165-195 seem to be a good range provided you can get oil temp up.  This is
>where oil cooler/warmer is good. But on stock gm blocks/ heads high temp
>plays havoc on their "shape". Due to that cylinder thickness, deck thickness
>is fairly thin. Now if you used a bowtie block that had been annealed you
>can run your 240-260 no prob or if you have used reg. block and fill block
>half full of block cement to prevent the cyl walls from going crooked and
>busting.  Fords are even worse .. :-)  ESP 3.8 v6 heads   I hate them!!!!
>All of them are like bananas within 60 000km and the seats pounded so bad
>that have to put new ones in to get a seat, valve guides all wore ect ect
>ect.:-)    BTW  it also depends on what you run your clearances at and your
>rpm ie rod,pist-wall, main valve-guide. 
>Mike Rolica
>EXT. 260
> :-)
>
>
>-----Original Message-----
>From:	Daniel Ciobota [SMTP:dciobota at hiwaay.net]
>Sent:	Friday, September 24, 1999 7:47 PM
>To:	gmecm at efi332.eng.ohio-state.edu
>Subject:	Re: Operating temps
>
>Well, since this is a gm ecm list, and we're talking gm operating temps, the
>stock L98 corvettes (84-91 models) had fans that kick in at 230deg... on hot
>summer days with ac on, it's not uncommon to see operating temps on those
>cars
>climb up to 240 before coming back down.  This happens regularly on those
>motors, with no damage to them.  Btw, the boiling point of 50/50 antifreeze
>is
>somewhere around 265deg... synthetic oil starts to turn to tar at 470deg I
>believe.  Oil temps run regularly to 260deg on those cars as well.
>
> Just another (gm) datapoint.
>
>Daniel
>
>
>Mike Rolica wrote:
>
>> DRUGS!! LOOK WHAT THEY DO!!  The highest thermostat I've ever seen is 195
>> deg at 280, serious engine damage occurs!  Mine runs at 212 max! oh by the
>> way  my 1999 vw golf vr6, the first fan kicks on at 203 off at 195  second
>> kicks on at 212 off at 200.  At 220, the ecm kills the motor!  Been there
>> too.
>> Mike Rolica
>> EXT. 260
>>  :-)
>>
>> -----Original Message-----
>> From:   David Cooley [SMTP:n5xmt at bellsouth.net]
>> Sent:   Friday, September 24, 1999 3:15 PM
>> To:     gmecm at efi332.eng.ohio-state.edu
>> Subject:        RE: Operating temps
>>
>> At 02:52 PM 9/24/1999 -0400, you wrote:
>> >DO THE PISTONS EVEN SLIDE IN THE BORES AT THAT TEMP? MIGHT BE KINDA HARD
>ON
>> >RINGS AND STUFF, BE PRETTY TIGHT!  DE HEADS (ESP. ALUM.) MIGHT LOOK LIKE
>> >BANANAS :-)
>>
>> Ya Know,
>> Any new vehicle you buy with an electric fan runs at 220 to 225 before the
>> fan kicks on. 240 isn't that hot compared to 220-225...  Oil temp (without
>> a blocked cooling jacket for the water...) will probably be within 10
>> degrees or so of the water temp.  This has been the case since the
>> early-mid 80's.
>>
>> ===========================================================
>> David Cooley N5XMT Internet: N5XMT at bellsouth.net
>> Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
>> We are Borg... Prepare to be assimilated!
>> ===========================================================
>