TRW Pistons vs. JE SRP Pistons

A

ALBERTAN

Member
Just thought I'd post a few pics comparing the TRWs to the SRPs for our application. I took these pictures while at the engine builder's this past weekend. First up the venerable TRW...

trw1.jpg


Then this is one of my SRPs...

je1.jpg


The weight on the SRP should read 624gm compared to the 696gm for the TRW. 72 gm difference. And any one of myself, Tony, or Nolan will tell you its a notable 72 grams. The engine builder says every 50 grams is roughly equal to 15 horsepower. Don't know on what sort of build that figure applies to though. Less reciprocating mass effectively makes all the other parts like the crank stronger too which is why I did it. The free horsepower thing was a bonus. The downside? These pistons are roughly half again as much as the TRWs. Just figured I'd put out a little food for thought for the others currently rebuilding their motors.
 
Tydriver

Tydriver

TurboLS6 Powa'
These pistons are roughly half again as much as the TRWs.
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What you mean ??????? Price ??? Sorry must be the fact that I dont speak canadian :wink: (kidding only kidding)
Just figured I'd put out a little food for thought for the others currently rebuilding their motors.
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Dude...... U da man, I appreciate seeing these kind of informational/informative posts... This is the reason I signed up to the BBS and the List.....

One quick Q for ya tho... I assume that was a new TRW ?.. Otherwise the weight may have varied from OEM, due to wear and carbon build up ??

Yes ? No ??

Thanks again !
 
B

BillC

New member
Got a question about the pictures: In the top picture, the TRW piston (weighing 696 grams) has the wrist pin installed. In the bottom picture, the SRP (weighing 624) does not have a wrist pin. It would be very interesting, and a better comparison, to weigh both pistons without the wrist pins (unless the pins come with the pistons, then they should both be weighed with the pins). I'm willing to bet the wrist pin in the TRW picture weighs more than 72 grams, which would end up making the TRW piston lighter than the SRP (if you're gonna do comparisons, ya gotta keep all other factors equal, otherwise the comparison is invalid).
 
myclone

myclone

Donating Member
On 2002-02-05 09:13, BillC wrote:
Got a question about the pictures: In the top picture, the TRW piston (weighing 696 grams) has the wrist pin installed. In the bottom picture, the SRP (weighing 624) does not have a wrist pin. It would be very interesting, and a better comparison, to weigh both pistons without the wrist pins (unless the pins come with the pistons, then they should both be weighed with the pins). I'm willing to bet the wrist pin in the TRW picture weighs more than 72 grams, which would end up making the TRW piston lighter than the SRP (if you're gonna do comparisons, ya gotta keep all other factors equal, otherwise the comparison is invalid).
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Good thread! Like was stated... Need to see the weight with the wrist pins though...
 
10secTy

10secTy

Sy-Ty builder and Tuner
Geezz BillC give your head a shake do you really think we would weight the pistons with out one of the wrist pins. The pin was laid down inside the JE. Thats why you can not see it. Also these are both brand new never used pistons. No wrist pin, gezzzz must suck being so skeptical.

Nolan
 
A

ALLTRAC

New member
Did you by chance weigh the pistons without the pins in?

The JE pins should be light weight and I would like to know just what the actual difference in piston weight is.

Ryan
 
B

BillC

New member
The pin was laid down inside the JE.
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Well, you can't see the pin in the picture, and you didn't say anything about it in the text underneath. How was I supposed to know?
... gezzzz must suck being so skeptical.
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No, being skeptical is good. Being skeptical keeps you from being ripped off by wild claims or unfair comparisons. What sucks is being publicly derided for asking questions about what appeared to be an unequal comparison (by all the evidence presented).
 
10secTy

10secTy

Sy-Ty builder and Tuner
Yep your right, I overreacted. I apologize, we will make sure we put proper decriptions next time. I just don't understand why you would think we are trying to deceive you, when all we are doing is sharing some information we have. We have nothing to gain from misleading you.

Any way no we did not weigh the pistons without the pins. If we have a chance this weekend we can try to get the pin weight and piston weight. I can't remember if Dean took pics of the dish of both pistons. If you did post them up. The JE's are Sweet!

Nolan

<font size=-1>[ This Message was edited by: Canadian SY/TY on 2002-02-05 12:51 ]</font>
 
A

ALBERTAN

Member
92 Typhoon - Yes I am referring to the price being half again as much for the SRPs. And yes the TRW was a brand new piston. Its one left over from Tony's build when the shop bought 8.

Methuselah - I may yet be a poopie head. The jury is still out on that one.

typhoon4ever - Why didn't I go with regular JEs? Well, like anything good, excess can be bad. While lighter (see below), the engine builder didn't think the regular JEs would be strong enough for what we are up to.

BillC - Heya Bill. Excellent point about the wrist pins. Made me go ACK for a sec. The builder is the one who set them on the scale. But as Nolan so...errrr...eloquently pointed out, the wrist pin is in the SRP. You can see it if you look close. My apologies for not pointing it out. I am a newb mechanic so I easily overlook such things. I thought it was great that you pointed it out. Regardless there is absolutely no doubt that the SRPs are much lighter.

myclone - The engine builder gave me the following weights (without the wrist pins I am assuming). The 69 grams corresponds closely to the difference with pins.

  • TRW - 565 grams
  • SRP - 496 grams
  • JE - 443 grams

I wanted to go with the JEs and Carillo rods but the builder talked me into the current build. Go figure.

Canadian Sy/Ty - Its all good buddy. :wink: I don't have any pictures of the dishes. I do specifically recall admiring that feature of the SRP though...

_________________
Dean Higson
http://www.turbogm.com

  • 1991 GMC Syclone #1406
  • 1992 GMC Typhoon #2194
  • 2000 SVT Lightning #4320


<font size=-1>[ This Message was edited by: Albertan on 2002-02-05 14:46 ]</font>
 
B

BillC

New member
I just don't understand why you would think we are trying to deceive you...
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Never said anything about deceit. I had assumed it was just an oversight.

...when all we are doing is sharing some information we have.
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Sharing correct information is wonderful, and I fully support it. Unfortunately, there has also been a lot of incorrect info spread around, and I was just trying to catch a possible mistake. I didn't mean to imply that anything shady or underhanded was going on. I apologize if that was how you interpreted my earlier comments.
 
10secTy

10secTy

Sy-Ty builder and Tuner
Yep sorry BillC I did take it the wrong way.
Any way we will be posting as much info as we can in the future.

Also just want to clear up that the SRP's are twice as much as the TRW's.

Nolan
 
TurboTony

TurboTony

Active member
I will stop by the shop this week and weigh the pistons witout the pins and take some pics, just for curiosity sake. :smile:

Also get some pics of the faces to compare, the srps are pretty sweet looking pieces, kinda makes me wish I bought em instead. :cry:

Keep in mind all the wieghts are in canadian, so they are only worth 62% of US weights :roll:

TurboTony
 
A

ALBERTAN

Member
Some people have e-mailed me asking for the part number for the JE SRP pistons. I don't have it handy. Tony will grab it next time he is in to the builder's and post it here. Nothing like a little pass the buck. :grin:
 
G

Guest

Guest
so your saying the SRP are stronger than the regular JE? if thats the case why do all of these race cars that push out 1000hp buy regular JE's over SRP? just wondering
 
RAACCR

RAACCR

Member
On 2002-02-05 21:26, typhoon4ever wrote:
so your saying the SRP are stronger than the regular JE? if thats the case why do all of these race cars that push out 1000hp buy regular JE's over SRP? just wondering
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Because they want the lightest pistons available that will hold togather for their T.B.O. duration. There's a big difference between street motors that are expected to last 10s of thousands of miles between overhauls, vs. competition motors that get torn down after every race. The trade-off is simple...weight vs. strength. The TRWs are absolutely bulletproof, but a bit on the heavy side. Despite the weight penalty, I still don't think twice about spinning my heavy TRW piston / Eagle rod equipped motor to 7000 rpm.
 
TurboTony

TurboTony

Active member
I'm not 100% sure on this...

Srp's are Je's second line of pistons, kinda like cadillac and buick :smile:

Srp stands for sportsman racing pistons.

If I understand this right the True Je's start life as the same piston but are lightened even more.

Engine guy suggested srp's because they are slightly stronger and cheaper that je's

Again, I'm not totally sure on that, so please feel free to correct me if I'm wrong :grin:

I will ask tommorow

TurboTony
 
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