I am looking to upgrade the internals of a GSR, all motor, daily driver duty.

I need to use a larger bore piston, so will prolly need to go aftermarket. (I was also told there is an ITR piston that's .5 over ?!?!? Need more info on that.

But I run JEs and am very satisfied with them ('cept for the slap) But don't want to go all out for this motor as it doesn't need it. I am considering SRPs as an alternative as their clearances are tight and they are forged.

Anyone using/running SRPs in a daily ? Satisfied with them ? Any problems ?

Many people diss SRPs, but most of 'em have never even seen a forged piston, much less run one.... so any actual experience with this brand would be sweet.

I am aiming for a mid 11 CR and they may see a small shot of nitrous in the future (50 or less) for Sheets and giggles, but nothing over that.

Tanks
X2

 

factory pistons are available in .25 overbore.
i would recommend the b16a piston over SRP. Or anything except arias over srp.

 

I already have a set of CTR .25 overbore pistons (for SALE, Brand New w/rings on GSR rods $320 ) but I need something in a .30 over (or a little bigger)
I was looking to run stock pistons, but from what I've seen, Honda's biggest over bore is .25 SRPs are cheap and forged, granted the silicone content is higher, but they also run quieter. This car will be about 11.5:1 CR and driven by my G/F, so I figure the parts don't need to be hardcore, but I want them to last a while.

SgT, have you run SRPs before ?

 

bump,
i'm curious about the srp's as well... same deal 11.5:1 w/a 75shot or so

 

Kinda long... but pretty interesting info...

Ok, I have been speaking at length with one of the local tuners here, he runs a private shop and has established clientelle. In the process of determining his knowledge, I have found him to be exceptional in levels of detailed knowledge and skill. He is an NSX cert. tech and an All Motor specialist. I had a lengthy discussion with him last night and I had explained my plan for this GSR motor... which is this:

Gsr head, milled slightly, sleeved block, overbore at least 30 over (not .30 as I said earlier...more like .60... my bad ) ~11.5:1 CR and the capability of holding a properly fueled 50 shot. For this setup, total cost is a factor and this car is not ***** to the wall powerful, so I asked about the SRP instead of a JE. This tuner recommended the SRP as a good alternative, even over Ross... another option I have been researching.

What I was told was the SRP pistons are covered by JE as a specially designed import app. The SRPs run tight clearances (they can, due to a higher silicone content), their clearances are even tighter than JE's. You see this clearly when you run a car w/ a JE piston (mine sounds like a big rig). The SRPs are quieter on startup and (supposedly) almost stock sounding while the motor is running at operating temp. Although the higher silicone content and slight differences in the forging process give the SRPs limited capabilities as their production material is more dense, which causes them to retain more heat during extended exposure to elevated temps (that's a lot of 'E' words ! ). This higher silicone content, and more tightly packed molecule, allows them to run tighter clearances than others, maintaining quiet operation...but.... limits their abiilty to withstand high amounts of boost and/or extended bouts of nitrous.

After absorbing this info...It's my opinion that the GSR oil squirters will definitely aid the SRPs in keeping cool under juiced conditions. The motor I intend to use them on will see nitrous on occasion, but not as a religion as the car will be relatively quick off the bottle.

I am still researching and looking for other opinions and have looked at other brands such as Race Engineering, Ross and will be looking into Weisco very soon. I would appreciate any info.... particularly from users (or former users of SRP pistons).

I hope this info has helped out others as well.... keep 'em coming !

X2

 

ttt

 

I would never use SRPs. I have tried them before, they are junk.
Cost is a factor yet you are willing to just sleeve a motor on a whim?
My suggestion is to go to 81.5 or 82mm. Talk to jeff@importbuilders about
a set of pistons.

 

my SRP slugs are causing piston slap in my motor. i've got 9:1 SRPs and going F/I soon but not while it's making that damn noise.

 

SRPs and boost dont mix.

 

Just to clear up something,JE pistons make SRP pistons with same forgings exept SRP is an affordable line for (Sportsman Racing Products) in otherwords When you want JE quality at an affordable price.
The biggest problem I've seen with good quality pistons is that the machine shops don't measure the piston skirt at the right place and give either to tight or too loose clearance for the application.
Personally I use JE , SRP , and CP in all the fast motors and record breaking motors too
Also know engine builders in NHRA and NASCAR that swear by them too

 

SRP pistons are made with a different alloy composition which makes them different
from their standard line, and at the same time makes them weaker.

 

Same forgings not material
I've built 560 hp street driven motors with SRP's and no problems yet
Its been 3 yrs now and still running like a swiss watch.


[Modified by tk, 9:17 PM 9/6/2002]

 

No, I am not willing to sleeve a motor on a whim... I happened to come across a legit, sleeved motor that's already 20 over at a steal of a price.

And yes, cost is a factor... cost is always a factor when you don't make mad flow. Is cost not a factor to you ? Don't you think that a JE piston that costs $600+ for a custom application is a bit more than a forged SRP at under $500 ?


I am curious... what motor did you use those SRPs in ? N/A, turbo, s/c, n20 ? What compression were you running ? Did you use the rings that come with SRPs, or JE rings ? Did you have the pistons prepped before they were installed ?
What exactly was 'crap' about these pistons ? Too much slap, bad clearances, bad install... what ? Did they break on you ? Where you shooting them with over a 75 shot or something ?

Pistons with a high silicone content typically can only handle about 100 hp over stock... straight 4340 moly cuts off the shelf handle about 200 hp over stock... so could you provide a little more detail than...'crap' ?


BTW, Are you suggesting the 81.5 or 82 mm bore on a whim ? I am looking for piston brand and actual performance here... not bore recommendations.

X2

[Modified by X2BOARD, 4:16 PM 9/6/2002]


[Modified by X2BOARD, 4:18 PM 9/6/2002]

 

Information that would be helpful in your original post.

The price for JE and SRP are the same. Maybe im just looking in the wrong places.

1 11:1 NA and 1 9:1 turbo
Both situations pistons cracked. Everything was set to JE's specifications and
the motor ran great until they failed. I had never had a problem with JE so I was
rather surprised to see that happen.

I believe i said junk

On a whim? No because those are the next sizes up that the block can handle.
And I told you to contact importbuilders for pistons didnt i? its obvious that
you have your mind made up and set in a certain direction. If you want to argue,
then argue with someone else.

 

Thanks for your input, SgT. I have not heard much actual negative experience with the SRPs.

Many people bash them, but have never used them. I am quite skeptical about the term 'crap' as I need actual experience using the pistons. I apologize for not mentioning the sleeved block, but just really wanted feedback on the piston itself. Just so you know... SRPs price is about $100-$200 less than the JE's, and JE did comission this line to represent lower Hp import apps, so I have a hard time believing the SRPs are just total crap as you so kindly put it. A very respected engine builder down here has used them in mild apps before and would use them again... just not for heavy nitrous or boost.

I have not made up my mind yet, but the SRP is tempting... just need more info.


And, yes I like to argue... heh...

X2

 

X2:

More food for thought:

If you're stressin' over it this much now, just splurge the extra $125 and get the stuff that you know is gonna work for you.

When I was pricing out my stuff for my D16A1/ZC, the difference in cost between SRP and JE/Wiseco was about $125. JE and Wiseco pistons usually run about 540-550 shipped for pistons + rings. A lot of the places that quote pricing for SRP pistons do not include the cost of the rings (Flatlander comes to mind). SRP's usually sell for $350-$380 per set + $80 for the rings = $430 to $460.

Once the stuff is in the car, $100 is a very small price to pay for piece of mind.

I decided on the Endyn/Wiseco setup and I'm happy.

My 2 cents...

Sonny

 

I want to check out the Weisco pistons, but haven't found a good price on 'em.... any place you can recommend to price 'em ?


[Modified by X2BOARD, 1:59 PM 9/9/2002]

 

Larry @ Endyn has a very large selection of custom spec Wiseco pistons. Jeff @ Import Builders has some custom spec Wiseco pistons as well.

importparts.com carries JE.

Race Engineering (http://www.raceeng.com) sells a great selection of pistons. They are one of the more hardcore shops. I like them.

Sonny


[Modified by Sonny, 12:39 PM 9/9/2002]

 

Yeah, got my pistons from Race Eng... Don't want to waste $$ on Endyne... that guy just charges you for balancing and prep work....**yawn** you need to get that done to your pistons anyway, and he charges too much for that chimp work.

X2

 

What did you end up getting?

The price of the JE's and the Endyn/Wiseco's were the same when I bought my stuff, so that chimp work was essentially free.

Sonny

 

Ahh... true, good point. The guy assembling the bottom end does this as part of the cost anyways.

I havne't chosen the piston yet... but I know I will need a custom size... 30 over (not mm) is not an off the shelf size. So whatever I get will have to be custom ordered.... from my experience, custom pistons w/o a rush order take 2.5-3 wks.

X2

 

SRP is made of 4032 High Silicon Aluminum. A crack in this type of aluminun spreads and sudden failure.

2618-T6 Aluminum (JE, Ross, Arias) will not do this and cracks don't propagate in this type of aluminum so this gives you some warning of piston failure.

 

What would you need to throw at a forged aluminum peice, such as the higher silicone content pistons to crack one ? I would just figure that these peices are stronger than stock cast parts.

And as well all know, people boost and hit nitrous on stock pistons everyday.

 

Detonation.

 

Detonation that wouldn't kill stock piston ? The cast ones don't die at 10.8:1 like an ITRs... so why would the SRPs style be prone to detonation (I know they don't dissapate heat as fast as the JEs... but say wha..)

X2