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#2550069 - 02/27/12 10:54 AM Engine wear and E85
friendly_jacek Offline


Registered: 05/04/03
Posts: 5801
Loc: southeast US
or rather lack of.

Not sure if posted before.



http://www.camaros.net/forums/showthread.php?t=143372

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#2550080 - 02/27/12 11:03 AM Re: Engine wear and E85 [Re: friendly_jacek]
cchase Offline


Registered: 11/03/09
Posts: 3999
Loc: New England
Where is the cross-hatching?

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#2550093 - 02/27/12 11:09 AM Re: Engine wear and E85 [Re: cchase]
friendly_jacek Offline


Registered: 05/04/03
Posts: 5801
Loc: southeast US
Originally Posted By: cchase
Where is the cross-hatching?


good question.

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#2550144 - 02/27/12 11:59 AM Re: Engine wear and E85 [Re: friendly_jacek]
Brons2 Offline


Registered: 09/16/03
Posts: 2636
Loc: Austin, Texas
how many miles on that motor?

I will agree that the tops of the pistons look extremely clean.
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#2550145 - 02/27/12 12:02 PM Re: Engine wear and E85 [Re: friendly_jacek]
PZR2874 Offline


Registered: 05/06/11
Posts: 499
Loc: San Antonio, TX
Did he run in that hard where it's all "worn" or is it a load and he was taking a pic at the machine shop before the honing?
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#2550151 - 02/27/12 12:07 PM Re: Engine wear and E85 [Re: PZR2874]
friendly_jacek Offline


Registered: 05/04/03
Posts: 5801
Loc: southeast US
Originally Posted By: PZR2874
Did he run in that hard where it's all "worn" or is it a load and he was taking a pic at the machine shop before the honing?


description in the quoted forum:

Quote:
Engine is SBC 4.145" bore x 3.800" stroke with SRP forged flat top pistons. This is a solid roller cammed engine that is 11.4:1 compression and has been run almost exclusively on E85 since spring 2007. It did have 6 months run time on gasoline before the switch. I was surprised at how clean everything is -- I have NEVER seen pistons this clean after 2 years of use.

There was no ridge at the top of the cylinders, and no scoring or other signs of a lubrication problem in the bores. Engine has 250+ quarter mile passes on it and 15,000 street miles. I cruise on the freeway at 3400-3600 RPM and do NOT take it easy on this thing.

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#2550152 - 02/27/12 12:10 PM Re: Engine wear and E85 [Re: friendly_jacek]
PZR2874 Offline


Registered: 05/06/11
Posts: 499
Loc: San Antonio, TX
So gapless rings then?
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#2550156 - 02/27/12 12:13 PM Re: Engine wear and E85 [Re: friendly_jacek]
NHGUY Offline


Registered: 10/09/11
Posts: 3656
Loc: USA
Cross hatching is the marks left from cylinder honing.Its how the rings break in and make a seal.

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#2550180 - 02/27/12 12:29 PM Re: Engine wear and E85 [Re: friendly_jacek]
PZR2874 Offline


Registered: 05/06/11
Posts: 499
Loc: San Antonio, TX
Correct, but I didn't realize he was using gapless rings... I was looking for the hatching and agreed with everyone else. Still, very clean cylinders.
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#2550200 - 02/27/12 12:42 PM Re: Engine wear and E85 [Re: friendly_jacek]
HerrStig Offline


Registered: 08/24/11
Posts: 3933
Loc: Boston, MA
How's the fuel consumption on E85? Just bought a new Poulan 4 cycle snowblower and the manual (I read them) says the warranty is void if more than 10% alcohol is used.


Edited by HerrStig (02/27/12 12:43 PM)

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#2550218 - 02/27/12 12:57 PM Re: Engine wear and E85 [Re: cchase]
friendly_jacek Offline


Registered: 05/04/03
Posts: 5801
Loc: southeast US
Originally Posted By: cchase
Where is the cross-hatching?


the answer is on the page 4

Quote:
cross-hatch still there just doesn't show in the pics. It was lighter than when fresh though. No ridge at top of cylinders. Remember I drove this motor a lot of miles at high RPM on the freeway (3600 RPM) so I expect some wear.


http://www.camaros.net/forums/showthread.php?t=143372&page=4

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#2550264 - 02/27/12 01:42 PM Re: Engine wear and E85 [Re: friendly_jacek]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 15808
Loc: Sunny Florida
Very nice. I agree those are some clean pistons.

I guess the camera lacked the resolution to show us the cross hatch. otherwise there should be a deep ridge.


Edited by SteveSRT8 (02/27/12 01:45 PM)
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#2550304 - 02/27/12 02:14 PM Re: Engine wear and E85 [Re: friendly_jacek]
friendly_jacek Offline


Registered: 05/04/03
Posts: 5801
Loc: southeast US
I'm thinking E85 could be one of the best combustion chamber cleaners. But, not available in my area.

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#2550313 - 02/27/12 02:18 PM Re: Engine wear and E85 [Re: friendly_jacek]
SEMI_287 Offline


Registered: 02/25/11
Posts: 992
Loc: Up State NY
What oil was used?
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#2556139 - 03/03/12 09:45 PM Re: Engine wear and E85 [Re: friendly_jacek]
morris Offline


Registered: 08/24/08
Posts: 3681
Loc: ks, wichita
looks like it ran dry.

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