EVERYBODY LOOK!!!!!!!

[Mr Rogers]

Wanna Get High...... Compression

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>We spoke to representatives at JE Pistons to check out some of the company's new engine hardware and to clarify the differences between the SRP and Pro Series pistons. SRP pistons are manufactured of forged 4032 high-silicone aluminum alloy which was chosen for its superior lubricant handling and tight piston-to-wall clearances. This makes for a quiet running street engine that has all the advantages of a factory style engine while still retaining race-ready capability. Pro Series pistons are manufactured from a slightly tougher 2618 series aluminum alloy for a stronger piston that is more at home on the race track than on the street. JE reps also told us that they can create extremely high compression pistons by actually computer-plotting the interior of an engine's combustion chamber. This computer plot is used is CNC mill a piston so that it fits into the cylinder head combustion chamber like a key in a lock at top dead center.<HR></BLOCKQUOTE> This info is courtesy of www.Overboost.com and I thought that since lots of people ask questions on the differences that I would post this. This is the first time I have ever seen a reason "in writing" from the manufactures themselves.

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98 GS-scR w/ 8psi JRSC, Walbro HO fuel pump, AEM cai, DC 4-2-1 one piece header, Thermal Exhaust, Skunk Works cam gears, J&S safeguard, RC 310's, Cartech FMU, Vortech regulator, H&R sports and KYB AGX's, and of course to slow down, KVR X-drill F&R rotors and Carbon Kevlar pads and V1 to signal the slowing down. *ITR LSD, JR flywheel, Clutch Specialties stage 4, NX Gen-X kit and CF diet going on soon....
Best et ==>13.6 @ 103mph w/ 2.3 60ft on Nitto drag radials

[This message has been edited by Mr Rogers (edited December 22, 2000).]

[PSIdreams]

So does JE make them to fit YOUR cylinder head, or some generic head that they scanned in?

[Marc]

Holy cow! The dome on that piston is huge. It absolutely dwarfs the dome on CTR pistons.



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Marc
1997 Civic EX
The supercharger is gone. Get ready for the turbo.
My horror story regarding the JRSC is coming soon...

[JRCivic]

Actually, they would scan YOUR head if you sent it in to them. At the SEMA show, they displayed a Harley Davidson piston that was milled to match the combustion chamber... and I believe that the compression ratio was 13.5:1 !!! It was quite impressive. The piston shown above is going to be a stocking item... this is not one from the milling process as described above.

Jim


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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph

[SteveW]

Damn i wish the people in my life knew about stocking stuffers like this. All i will get is candy and maybe a few cheapo things. Nothing like new pistons, or a new fpr, or say a new car oh well wishful thinking.

Steve

[Import Tuner]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by JRCivic:
The piston shown above is going to be a stocking item... <HR></BLOCKQUOTE>

Jim:

That might be the wrong wording, this time of year...
(but I went out and got 3 more stockings, just in case)...

[JRCivic]

Sorry...

Didn't mean to get anyone's Christmas hopes up.

Let me clarify: JE/SRP will be keeping the 12.5:1 pistons in 81mm standard bore as well as .020 and .040 overbore sizes on the shelf... in stock and ready for delivery.


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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph

[Marc]

Jim,

What's the difference between JE & SRP pistons? Is the JE stuff more for track use and the SRP more geared more street use? Correct me if I'm wrong but don't the JE pistons contain a lot of silicon?

Marc

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Marc
1997 Civic EX
The supercharger is gone. Get ready for the turbo.
My horror story regarding the JRSC is coming soon...

[JRCivic]

I believe the SRP pistons have the greater content of Silicon... the advantage of the silicon is it is quieter on the street... there is not any "Piston Slap" heard like the JE pistons. The bad news is that the silicon is not as strong as aluminum, so the overall strength of the piston is less than that of a JE. The JE has a very LOW silicon content, which allows the piston to expand when heated up. Thus, greater wall clearances are required when the piston is cold so that it has the right clearances when warmed up to operating temperature... this is where the "Piston Slap" is heard.


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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph

[Mr Rogers]

I thought the answer (cut & dry) to that question was in the original post? That is why I posted it. Owell, I always love to hear Jim reply anyway.

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98 GS-scR w/ 8psi JRSC, Walbro HO fuel pump, AEM cai, DC 4-2-1 one piece header, Thermal Exhaust, Skunk Works cam gears, J&S safeguard, RC 310's, Cartech FMU, Vortech regulator, H&R sports and KYB AGX's, and of course to slow down, KVR X-drill F&R rotors and Carbon Kevlar pads and V1 to signal the slowing down. *ITR LSD, JR flywheel, Clutch Specialties stage 4, NX Gen-X kit and CF diet going on soon....
Best et ==&gt;13.6 @ 103mph w/ 2.3 60ft on Nitto drag radials