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What goes into an E prod engine

Old 02-11-07, 04:07 PM
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What goes into an E prod engine

Hi all,
I recently found some some E prod engines for sale. This led to the next question on my part: What goes into making an E prod 12A or 13B engine? I'm not a racer myself, but the prices for the engines were reasonable with virtually all new parts so I am considering buying them.
I did a search on this board but really couldn't find much. If there is a website out there detailing what is done to these engines I would appreciate a link.
Thank you,
Peacedog
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Old 02-11-07, 04:54 PM
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There's an E-prod board somewhere... I think its associated with the Colorado Region of the SCCA.

Call Steve Burkett at www.tuxedoparkracing.com He ran a 12a in EP for a while before building his RX8. Tell him Scott from Izzy's sent you.
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Old 02-11-07, 05:42 PM
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Where to start,
Big street ports
As many light part as you can think of
The best ones will have ceramic apex seals
Oil system mods
Balanced
Eshaft tapered on mains
Just about every rotor mod you've read about anywhere

Is all detail work and then all the good parts that exist. You can have an EP engine with nothing done but porting I guess. The rules basically say you can modify stock parts, replace parts that wear out with anything, porting is limited to street port, no bridge,J, or PP. The money for a good one goes the same places it would in a good racing build for anything its just fitting within a rule structure that limits the power. Expect either to have about 230(12A) -250hp(13B) at the flywheel if the are good.
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Old 02-11-07, 06:51 PM
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Fellas,
Thanks for the comments. So I am guessing that the rotors would be beveled and lightened? As a side note, how long would one of these engines survive in a street car?
Again thank you for the response,
Peacedog
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Old 02-11-07, 09:42 PM
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Probably beveled, should be lightened.

Should last a long time if everything is done right. Depending on the goal for the engine you can fudge some things like grinding plates a little more. You know your going to pull it apart in less than 100 hrs so longevity in thousands of miles isn't an issue. Other than that it should be OK, it may be a little "peaky" on the power band for normal street driving but occasional use would be fun. It would be loud if you expect to keep that power level, exhaust is one of the major keys to power.
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Old 02-11-07, 11:06 PM
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Originally Posted by jgrewe
It would be loud if you expect to keep that power level, exhaust is one of the major keys to power.
Like 103db at full gate, we make the exhaust pipe so that we can point it away from sound control. I just can't see making one a dd. The port is very big in a proper ep motor. Some sound almost BP like at idle. Pretty much what jgrewe said goes for the rest. Mazda comp oil pan, baffle, locked distributor, custom header or SDJ, modifed weber 48, no fan, no alternator (on some).
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Old 02-12-07, 10:12 AM
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Fellas,
Thank you for the information. So basically an E Prod engine is a large streetport motor with all of the available high rpm mods running a low restriction exhaust? Sounds cool. For the record I never would have thought anyone could get 230hp out of a streetport 12A, but then again even the most free flow street exhaust is going to create ALOT more back pressure than what people have described here and used at the track.
Again thanks for the information. I'll go back to lurking and leave this forum to the real racers.
Cheers,
Peacedog
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