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Wanna Get High...... Compression
http://www.overboost.com/images/282/full/DSCN0364.jpg
<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).]
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So does JE make them to fit YOUR cylinder head, or some generic head that they scanned in?
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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...
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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
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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 http://www.hostboard.com/ubb/smile.gif oh well wishful thinking.
Steve
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<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)... http://www.hostboard.com/ubb/biggrin.gif
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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
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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...
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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
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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 ==>13.6 @ 103mph w/ 2.3 60ft on Nitto drag radials
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Thats childs-play, How about running a set of those and 9-10lbs of boost from a super charger. And then a 50 shot nos. I'd try it.
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That would be BIG power with BIG problems if the tune was off even a hair. I bet a small temp change would send your motor sky high if it wasn't re-tune right away. That would be cool to see though http://www.hostboard.com/ubb/wink.gif
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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
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by JRCivic:
Hey IMPORT TUNER...
What did you find today in those four stockings you had hanging on your mantle ???
heheh<HR></BLOCKQUOTE>
Jim:
Just got three additional stockings filled with candy and trinkets... http://www.hostboard.com/ubb/frown.gif
Guess I'll just keep throwing boost at these things... http://www.hostboard.com/ubb/biggrin.gif
[This message has been edited by Import Tuner (edited December 26, 2000).]
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I have the JE 9:1 in my GSR...just recently had them put in. Is it normal for it to sound like a 'diesel truck?' Does anyone know what I mean?
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1994 4 door GSR
Basically stock, other than:
Rev Hard Turbo Kit. Koni Yellow w/ GCs. And some other goodies...
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I will be running about 13psi and a 25 shot of NOS on my Blackbird... and I won't think twice about it.
By the way... I have a custom set of JE PISTONS in my motor.
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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph
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Hey IMPORT TUNER...
What did you find today in those four stockings you had hanging on your mantle ???
heheh
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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph
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Slightly quieter...not a whole lot...
But the new motor only has like 300 miles on it...maybe after it breaks in a little??
Thanks.
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1994 4 door GSR
Basically stock, other than:
Rev Hard Turbo Kit. Koni Yellow w/ GCs. And some other goodies...
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So you got the motor done.... Thats cool, hows it running? Im trying to make up my mind one a few things for my car... not sure though maybe big changes or a whole new car? very confused..........
nick
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95 GSR 4-DR Greddy exhaust and header, AEM CaI, Field Vtec controller, Power slots and metal axxis pads.
Eibach Pro springs, Tokico illuminas, Progress 22mm rear sway bar.
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That Diesel sound is piston slap I believe. Does the sound get quieter as the engine gets warmed up?
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by TRM04:
Slightly quieter...not a whole lot...<HR></BLOCKQUOTE>
Take it out and make a couple of hard runs on the motor (when your ready) or make a couple of high boost dyno runs...
Then let it idle,
If it still rattles alot when you have alot of cylinder heat in it, it's too loose...
Turn up the boost... http://www.hostboard.com/ubb/biggrin.gif
