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202 - SRP Forged Pistons

Started by _Ned Loh_ , Jan 31 2012 04:03 PM

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#1 _Ned Loh_

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Posted 31 January 2012 - 04:03 PM

It appears precision parts in VIC are now stocking SRP forged pistons for the 202 in 1.68" comp height

http://www.precision...px?CID=40241772

& 1.71" comp height

http://www.precision...px?CID=40241778

They list 0.040 & 0.060 over.

Price as listed on web site is $526.85 (inc GST. does not include rings) looks pretty good to me. I'll be investigating these further...but...interested to hear what any of you have to say???

(I have no association with sellers but given off the shelf forgies for the 202 are pretty rare I thought some may be interested.)

Edited by Ned Loh, 31 January 2012 - 04:04 PM.

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#2 greens nice

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Posted 31 January 2012 - 05:43 PM

took you long enough to find them, ive only mentioned them half a dozen times.

this is a message i sent to bomber about them.
his is the number from the site 1300-364350
http://www.precision...px?CID=39392976
and a link to the online store, just search em up.
it says they are srp, but they come in a je box, with je paper's, gudgeons etc, so i dont know.
i havent bought rings yet but they list rings on the site to suit made by JE, unsure whether they will be actual je's pro seal's or hastings or total seal though because the JE site is a gypsy.
they come with h-11 tool steel pin's, not taper wall yet the pin is only 8 grams heavier than a mahle taper wall pin.
the pistons weigh 85 grams less than ACL/Mahle.
have provisions for spirolocks and comes with a bag of spirolocks, although i wouldnt be bushing the little end of a starfire rod.
im unsure whether they will sell to you as your not a business but worth a try, if they say no you could go through Performance Wholesale..
top ring is 40 thou further down than a acl/mahle, so you can cut the valve releif lower in the block if you wanted to

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#3 greens nice

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Posted 31 January 2012 - 05:47 PM

edit: sorry they arent h-11 they are
5115 Low Carbon/Case-Hardened Steel
same gudgeon as 5.4l Ford Modular.

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#4 _oldjohnno_

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Posted 31 January 2012 - 06:35 PM

SRP are a part of JE. From the JE FAQ page:

3. What is the difference between JE and SRP Pistons?
Both JE and SRP are high quality forged pistons. JE Pistons are designed primarily for racing engines and are available for many "race specific" applications. In addition, JE Pistons can be custom made to your specification in as little as 5 days. SRP Pistons are manufactured as a "catalog only" piston and are not available in custom configurations. In addition, all SRP forgings utilize dedicated forgings that reduce the amount of machining required to complete the piston. Since time is money, SRP Pistons are more affordable.

4. What is SRP Professional?

SRP Professional is the latest addition to the SRP product line. These high performance piston kits include many advanced features while maintaining a price similar to the existing SRP Piston line when purchased with rings. New features include lightweight FSR forgings, accumulator grooves and high quality 2.250" long wrist pins. In addition, the SRP Professional line features an industry first 1.2mm, 1.5mm, 3.0mm ring package. The 1.2mm carbon steel nitrided top ring is extremely durable and offers reduced friction over 1.5mm and 1/16" top rings. A 1.5mm Napier (hooked face) 2nd ring is used to improve oil control over conventional taper-faced rings. The combination of these new features can reduce the piston assembly weight up to 81 grams when compared to traditional SRP Pistons. Weight savings can be even greater when compared to other forged piston brands.

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#5 greens nice

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Posted 31 January 2012 - 07:23 PM

SRP are a part of JE. From the JE FAQ page:

yehp, i knew that.
as far as i was aware is that SRP's were the off the shelf, (street sorta stuff) and JE's were custom's with more attention to detail, but hey i have little experience with this.
these have their own mod number.

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#6 _Bomber Watson_

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Posted 31 January 2012 - 08:45 PM

Anyone used the Hypatec slugs on that page??

Similar to ACL race series??

Might be suitable for the engine im building a mate, if i cant make his budget stretch to the forgies heheehe.

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#7 _stretchlc_

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Posted 31 January 2012 - 09:16 PM

Sweet!...thanks for the link!

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#8 _oldjohnno_

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Posted 01 February 2012 - 06:07 AM

I think if an engine is tuned properly and detonation is avoided, then hypereutectic or even cast pistons will survive in nearly any n/a Holden six. Look at how many have been built that run 7500+ with plain old Duralites, and I know of SBC's that have been spun to 8000 with cheap cast pistons. Or look at high-output two-strokes, probably one of the toughest environments for a piston there is - often these still use a high silicon cast piston.
The biggest advantage of modern performance designs in my opinion is the thin ring pack, and of course forgies will withstand the odd brief exposure to detonation better than a cast piston.

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#9 _Ned Loh_

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Posted 01 February 2012 - 06:47 AM

took you long enough to find them, ive only mentioned them half a dozen times.

You sound like my high school teacher that told me I had better be good at sport!

Seriously now. The 85g weight saving is pretty good. What rods are you using? & How are you oiling the pin? I imagine they are made to suit these with a hone:

http://www.precision...px?CID=40525085

I can't think of a good reason why they would have moved the top ring down compared to a race series.

Do you have a photo of one?

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#10 _Ned Loh_

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Posted 01 February 2012 - 07:07 AM

I think if an engine is tuned properly and detonation is avoided, then hypereutectic or even cast pistons will survive in nearly any n/a Holden six. Look at how many have been built that run 7500+ with plain old Duralites, and I know of SBC's that have been spun to 8000 with cheap cast pistons. Or look at high-output two-strokes, probably one of the toughest environments for a piston there is - often these still use a high silicon cast piston.
The biggest advantage of modern performance designs in my opinion is the thin ring pack, and of course forgies will withstand the odd brief exposure to detonation better than a cast piston.

Basically agree. + in the event of failure the forgies and much less likely to fail catastphically minimising damage.

IMHO - at reasonable power outputs, the cost difference of these forgies compared to a set of ACL/Mahle Race Series looks to me like cheap insurance in a competition engine that is run hard all day. I'm starting to form the same view on conrods. Spending the dollars to properly prepare 30 year old rods is taking you a long way towards the cost of some new h-beams. I'll update my 'air cooled 202' thread from late last year at some stage but looks like I broke a conrod.

In a streeter that gets an occasional rev or 1/4 mile blat I don't think I would bother.

What do you consider a thin ring pack?

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#11 _stretchlc_

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Posted 01 February 2012 - 02:22 PM

Im seriously considering buying a set of those Forgies!...............really seriously considering!...mmmmmmmmmmm!

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#12 greens nice

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Posted 01 February 2012 - 07:12 PM

yehp, i bought a set, i'm using star trek/starfire rods still press fit as i dont like the idea of bushing them.
i sold a set of acl's and rings for $350 and bought these for $525, so in my eyes the extra $175 was well worth the reduction in Harmonics, (I HOPE).
they have a groove milled in the bore in the piston for oiling.
plus the added insurance is always good at 7500-8000rpm.

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#13 _Ned Loh_

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Posted 01 February 2012 - 07:31 PM

yehp, i knew that.
as far as i was aware is that SRP's were the off the shelf, (street sorta stuff) and JE's were custom's with more attention to detail, but hey i have little experience with this.
these have their own mod number.

I missed reading this post before. What is the JE or SRP part number on the box???

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#14 greens nice

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Posted 01 February 2012 - 07:37 PM

i will grab it for you tomorow as pistons are at work.

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#15 _Bomber Watson_

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Posted 01 February 2012 - 07:56 PM

OK had a chat with my mate....He has given me the nod to spend the coin on the forgies....But....

Playing around with some CC figures, im going to need a 6cc dish to get 10:1 (he's running a mild cam).

So, Kev, seeing though you have a set in your hands, do you recon the tops are thick enough to allow a bit of machine work??

6cc isnt a huge amount, but i'd prefer to get it milled around the combustion chamber shape if possible....So that will be a bit deeper than taking say a 75mm dia skim.

If not i'll do some sums on some of the hypertec ones.

Cheers.

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#16 greens nice

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Posted 01 February 2012 - 08:38 PM

mate at a guess i would have to say that is a NO..... they are quite a bit thinner in the crown than an ACL/Mahle.
ill have a measure tomorow and see what i come up with, how deep would the dish have to be? 80thou?

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#17 _oldjohnno_

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Posted 01 February 2012 - 08:43 PM

OK had a chat with my mate....He has given me the nod to spend the coin on the forgies....But....

Playing around with some CC figures, im going to need a 6cc dish to get 10:1 (he's running a mild cam).

So, Kev, seeing though you have a set in your hands, do you recon the tops are thick enough to allow a bit of machine work??

6cc isnt a huge amount, but i'd prefer to get it milled around the combustion chamber shape if possible....So that will be a bit deeper than taking say a 75mm dia skim.

If not i'll do some sums on some of the hypertec ones.

Cheers.

I take it that this will be a blown or gassed engine Bomber?

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#18 _Bomber Watson_

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Posted 01 February 2012 - 08:45 PM

Na, aspirated.

235 @ .050 on the cam, he's only going to be turning to to 6-6200.....

After a bit more thought I was trying to talk him into the hypertecs as well, but he wants the forgies...At first i wanted him to get them so i could see what they look like!!

If there not machine able then i'll talk him into the hypertecs...Or i'll just tell him there not and get the hypertecs.....

Brand new pistons he has now have way to much dish, comes up at 9:1 at zero deck, like a 16cc dish....

After i set everything up i'll just have to slap him on the wrist and tell him not to frOck with anything....He's a qualified mechanic that doesnt know how to use a timing light, but likes to play spin the dizzy...........

Cheers.

Edited by Bomber Watson, 01 February 2012 - 08:50 PM.

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#19 _oldjohnno_

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Posted 01 February 2012 - 08:53 PM

Jeez, talk about overkill. For something mild like that I'd choose hypereutectics over forged even disregarding the price difference. But if that's what he wants...

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#20 greens nice

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Posted 01 February 2012 - 09:57 PM

in that case, dont even bother about the JE's man, i would be sketchy about milling a 80 thou dish into them.
get him some hypertec's, they will even handle a 150 shot if he want's.

or if you want to be a bastard just tell him that the casties's are forgies

if you want, i can take some photos of the pistons and you can enlarge them and have a flog over them if you must lol.

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#21 _Bomber Watson_

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Posted 01 February 2012 - 10:12 PM

yes please re picks....I need some new porno

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#22 _Ned Loh_

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Posted 02 February 2012 - 01:42 PM

OK had a chat with my mate....He has given me the nod to spend the coin on the forgies....But....

Playing around with some CC figures, im going to need a 6cc dish to get 10:1 (he's running a mild cam).

So, Kev, seeing though you have a set in your hands, do you recon the tops are thick enough to allow a bit of machine work??

6cc isnt a huge amount, but i'd prefer to get it milled around the combustion chamber shape if possible....So that will be a bit deeper than taking say a 75mm dia skim.

If not i'll do some sums on some of the hypertec ones.

Cheers.

Have you already decked the block?