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Old 05-17-2010, 08:26 PM   #1
ASF Machine
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Default ASF Product Pre-Release E85 Ethanol Pistons

ASF Machine Forged Pistons for E85 by Ross Racing
2618 Alloy
C/R 10:1*
Bore Sizes Pretty Much Any...99.75, 100, (99.5, 100.5 & 101mm etc for you sleeved folk)
This is the old forging...


This is the new Forged Side Relief hotness:



Forged out of 2618 T-61 aluminum, the Ross FSR pistons features an in-board pin boss that accepts a shorter, lighter pin. The pin boss supports the skirt area and piston head with strategically placed strut and web that result in an extremely stiff, yet lightweight design.







E85 Ethanol blend is approximately 105 octane r+m/2 but closer to an effective 110-115 due to the cooling effects of the alcohol as well.
This can sometimes lead to odd characteristics such as poor cold start, spark blowout and cylinder quench at higher RPM.
A qualified tuner can help with these issues through adjustment of ignition timing and fuel mapping, for the most part but why not build your engine to optimize the characteristics of the fuel you use?
You wouldn't run gasoline in your Cummins Diesel would you?**
Benefits include much improved off boost torque and throttle response, better cold start, improved piston life in ceramic-coated severe duty applications and better fuel economy.
More info on E85 in Hotrod's FAQ
http://forums.nasioc.com/forums/showthread.php?t=803341
*Available in other compression ratios
**Can be used judiciously with pump gas in a "flex/dual fuel map" type situation.








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970.242.0919
Complete Builds, Cylinder Head Work, Porting & Polishing, Block Cleaning, Decking, Sleeving & Sizing

Last edited by ASF Machine; 03-03-2011 at 01:44 PM.
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Old 05-18-2010, 08:33 AM   #2
25rsti
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is there anything wrong with running these pistons on regular 93? for the occasional e85+meth?
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Old 05-18-2010, 11:22 AM   #3
ASF Machine
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"**Can be used judiciously with pump gas in a "flex/dual fuel map" type situation."

That said, I am really only recommending these to guys that are on E85 at least half of the time.
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970.242.0919
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Old 05-18-2010, 11:49 AM   #4
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Are these just a higher compression piston, or is it the coating that is special? Do you need to balance the rotating asembly when installing these?
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Old 05-18-2010, 12:56 PM   #5
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The standard duty is a higher compression piston built like a brick house.
The severe duty has a ceramic heat barrier crown in addition to the higher CR & brick house-rally-car-inspired slug design. We've implemented the heat barrier into the severe duty design due to anecdotal evidence we and other have witness during autopsies of some engines that were running E85, built and stock: ring land issues were not the norm in these failures.

Above is an early iteration of our E85 piston, this application was an 11.2:1 high altitude drag car.


As for balancing, these sets are weight matched, most forged rod sets are as well. The factory crank is usually extremely close but getting those last one or two grams dialed in never hurts. So no you shouldn't have to rebalance.

Last edited by ASF Machine; 05-18-2010 at 01:04 PM.
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Old 05-18-2010, 06:43 PM   #6
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price?
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Old 05-18-2010, 07:54 PM   #7
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I'm planning on a 2.0 block with 2.5 crank, can you get me some pistons that would work with this, including the coating? What rods would yourecommend also? X2 for price (PM)? Package deal?
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Old 07-24-2010, 05:11 PM   #8
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PM'd you.
There will be 3 sets of these in use at high altitude soon.
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Old 11-22-2010, 02:15 PM   #9
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I have a set of the 10:1 CR and I couldn't be happier!
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Old 11-22-2010, 06:37 PM   #10
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What makes a piston e85 compatible vs other aftermarket forged pistons? What part of these helps optimize the characteristics of the fuel?

Mike
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Old 11-22-2010, 08:19 PM   #11
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^ my question also.
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Old 11-22-2010, 09:09 PM   #12
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E85 likes higher compression. In fact it has been tested in NA motors up to 17:1 compression ratio. My particular engine, I am building at ~9.5:1 compression.

Last edited by crashtke; 11-23-2010 at 09:36 AM.
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Old 11-27-2010, 07:51 PM   #13
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Quote:
Originally Posted by GrimmSpeed View Post
What makes a piston e85 compatible vs other aftermarket forged pistons? What part of these helps optimize the characteristics of the fuel?

Mike
The higher compression flat top design to compliment the slower burn is the main thing that makes this an E85 piston. In addition to the flat top which should result in better flame propagation and quench than a given dish.

The ceramic coated crown is simply an added safety measure upon customer request.
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Last edited by ASF Machine; 03-03-2011 at 01:46 PM.
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Old 11-29-2010, 07:39 PM   #14
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Dyno numbers are trickling in....



E85 Pistons in an EJ255 swapped into a 96 OBS with a VF39...



E85 Pistons in an ASF E85 spec sleeved longblock sporting an ATP 35R...
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Old 03-03-2011, 01:48 PM   #15
ASF Machine
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Bump for the new FSR forging.
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Old 07-21-2011, 01:55 AM   #16
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answered my own question haha thanks

Last edited by watercooled; 07-29-2011 at 08:47 PM. Reason: reading
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