Hypereutectic piston durability?

Scrapla · 06-15-2003, 10:20 PM

Im getting a 347 installed soon, mods on it are gonna be 65mm TB, mild cam, 1.6rr's, gt40p heads (light port work done), trick flow street heat upper and lower intake and of course 3:73's. My car is a daily driver and will be raced at the track maybe a few times a year, Im also getting the NOS 5115 dry kit installed and wanna spray up to 150 a few of those times at the track probably just gonna use the 75 shot but you never know. My question is will these pistons hold up or should I stick with forged, I was goin this route cause it was in my budget and forged were like almost $1,000 more. Anyone suggestions or comments will help

MidNiteBlu 5.0 · 06-16-2003, 02:35 AM

dont even bother with thew hypers. Especially with a 150 shot of nitrous they will not hold up.

silver_pilate · 06-16-2003, 08:55 AM

That depends on the maker of the pistons. Yes hypereutectics are weaker than forged,and the don't like detonation. Also, with pistons such as Keith Black, the ring gap is more critical. They recommend a bit larger gap for nitroused applications to eliminate a problem they had with blowing ring lands off. However, if set up right (make sure your engine builder knows his stuff) and if the car is properly tuned, the hypers will hold up. Just look at all of the almost stock 96+ mustangs out there running blowers and spray.

Anyway, the short answer is if you can possibly afford it, go for the forged. Hypers could work, but I know that you will have better peace of mind going forged. I wish I did.

--nathan

Scrapla · 06-16-2003, 11:15 AM

Well whats a decent set of forged internals out there, some brand names that wont cost me alot but are still good.

Ackbar00 · 06-16-2003, 11:47 AM

Ill let you know, I am putting a 64mm Turbo on my 93 stock shortblock. Mabey I will run a poll to how long it lives

Scrapla · 06-16-2003, 03:27 PM

I cant really wait long he wants to order the inernals very soon besides what if I go NA and no juice and just wanna beat it up a lil here and there on the street or track.

Hozer 88GTConv · 06-16-2003, 04:11 PM

I have flat-top TRW's and have no probs...compression is about 9.5-9.6 with TFS heads.

silver_pilate · 06-17-2003, 10:41 AM

Scrapla,

You may think that you won't run juice or boost right now, and that's fine. That's what I thought. However, give it a couple of years, and you'll be dying to throw on the spray. I've got no complaints with my Keith Blacks. And if I had set the ring gap wider (I set it real small for good oil control and didn't think I'd ever want to spray) I would be spraying right now. If it were me doing it all over, I'd go with forged.

TRW's are fine for most street/strip applications.

--nathan

SmokinStangGT · 06-18-2003, 04:10 AM

Well i am running the keith black 12:1 compression pistons and i thought about running the forged, but the pistons i have are 30% silicon and since that means less wear and tear and less resistance it is better in the long run for N/A cars. I was thinking about putting a 75 shot on it when i break it in and need more speed but i would not go more than that. The pistons have been through hell and back, they had been urning coolent, my cam stopped spinning and the pisonts held up to the beating of the valves really good, so i think that you should be ok... but dont put anymore than 75 shot on and plus the pistons are lighter so it gives it a quick rpm pick up. The keith blacks are some damn good pistons!

Hozer 88GTConv · 06-18-2003, 08:02 AM

Yeah,
I have forged pistons but if I was in your position, I'd run N2O in increments and see what happens. Why not? If you are thinking about replacing your pistons, just drive it 'till you NEED to replace something.
I wouldn't slap a 150 shot on right away, but a 75 is worth a go...

good luck...

Scrapla · 06-18-2003, 09:28 AM

Thanks guys, the 150 shot was my mechanic gettin all excited after seein my NOS kit hes nuts but I really wanna stay N/A but I can also easily picture wanting a super charge more then NOS but its like I have the kit just sittin here so its like as mine as well spray and not waste it, the kit is still in the shrink wrap not even touched with a 10lb bottle

06-15-2003, 10:20 PM	#1
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	Hypereutectic piston durability? Im getting a 347 installed soon, mods on it are gonna be 65mm TB, mild cam, 1.6rr's, gt40p heads (light port work done), trick flow street heat upper and lower intake and of course 3:73's. My car is a daily driver and will be raced at the track maybe a few times a year, Im also getting the NOS 5115 dry kit installed and wanna spray up to 150 a few of those times at the track probably just gonna use the 75 shot but you never know. My question is will these pistons hold up or should I stick with forged, I was goin this route cause it was in my budget and forged were like almost $1,000 more. Anyone suggestions or comments will help __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

06-16-2003, 02:35 AM	#2
MidNiteBlu 5.0 I got something to say Join Date: Sep 2001 Location: San Diego, CA Posts: 1,557	dont even bother with thew hypers. Especially with a 150 shot of nitrous they will not hold up. __________________ 91 LX Hatch 5.0 - made for the twisties 89 LX Hatchback 5.0 5spd. stolen/stripped 4/7/05 http://www.mustangworks.com/cgi-bin/...splay.cgi?3494 1987 Toyota Pickup Ricer Haters Club Member #33 Want a custom gauge cluster for your Vintage Mustang? www.jmeenterprises.com

06-16-2003, 08:55 AM	#3
silver_pilate DURKA DURKA!! Join Date: Sep 1997 Location: Lubbock, TX...(TX panhandle) Posts: 1,418	That depends on the maker of the pistons. Yes hypereutectics are weaker than forged,and the don't like detonation. Also, with pistons such as Keith Black, the ring gap is more critical. They recommend a bit larger gap for nitroused applications to eliminate a problem they had with blowing ring lands off. However, if set up right (make sure your engine builder knows his stuff) and if the car is properly tuned, the hypers will hold up. Just look at all of the almost stock 96+ mustangs out there running blowers and spray. Anyway, the short answer is if you can possibly afford it, go for the forged. Hypers could work, but I know that you will have better peace of mind going forged. I wish I did. --nathan __________________ '91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back. Daily Car: '04 Infiniti G35 Sedan 6MT

06-16-2003, 11:15 AM	#4
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	Well whats a decent set of forged internals out there, some brand names that wont cost me alot but are still good. __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

06-16-2003, 11:47 AM	#5
Ackbar00 Rebel Fleet Commander Join Date: Oct 2001 Location: Huber Heights, OH Posts: 1,003	Ill let you know, I am putting a 64mm Turbo on my 93 stock shortblock. Mabey I will run a poll to how long it lives __________________ 1993 Mustang GT, PTK w/ T-64 - My Cardomain Webpage 11.25@123.5 on only 8 psi. 10.84@121 on only 1 headgasket "The Truth is, Your the Weak, and I am the Tyranny of Evil Men!"

06-16-2003, 03:27 PM	#6
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	I cant really wait long he wants to order the inernals very soon besides what if I go NA and no juice and just wanna beat it up a lil here and there on the street or track. __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

06-16-2003, 04:11 PM	#7
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	TRW Pistons... I have flat-top TRW's and have no probs...compression is about 9.5-9.6 with TFS heads. __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

06-17-2003, 10:41 AM	#8
silver_pilate DURKA DURKA!! Join Date: Sep 1997 Location: Lubbock, TX...(TX panhandle) Posts: 1,418	Scrapla, You may think that you won't run juice or boost right now, and that's fine. That's what I thought. However, give it a couple of years, and you'll be dying to throw on the spray. I've got no complaints with my Keith Blacks. And if I had set the ring gap wider (I set it real small for good oil control and didn't think I'd ever want to spray) I would be spraying right now. If it were me doing it all over, I'd go with forged. TRW's are fine for most street/strip applications. --nathan __________________ '91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back. Daily Car: '04 Infiniti G35 Sedan 6MT

06-18-2003, 04:10 AM	#9
SmokinStangGT Registered Member Join Date: Sep 2002 Location: IL Posts: 105	Well i am running the keith black 12:1 compression pistons and i thought about running the forged, but the pistons i have are 30% silicon and since that means less wear and tear and less resistance it is better in the long run for N/A cars. I was thinking about putting a 75 shot on it when i break it in and need more speed but i would not go more than that. The pistons have been through hell and back, they had been urning coolent, my cam stopped spinning and the pisonts held up to the beating of the valves really good, so i think that you should be ok... but dont put anymore than 75 shot on and plus the pistons are lighter so it gives it a quick rpm pick up. The keith blacks are some damn good pistons! __________________ 89' GT with 5spd Hurst short throw, Keith Black 12:1 comp. pistons, Sealed Power drag racing rings, Fms F303 Cam, Ported and polished upper and lower intake with Ported E7TE heads that contain comp. cam double coiled springs with titainum locks and steel retainers, Fel-Pro Head Gaskets, 9mm ford racing wires, BBK chrome unequal shortys, Power Throttle bodies 70mm, Edlebrock 70mm EGR plate, 15inch K&N, Bassani X-pipe, Flowmaster 40 series, Eibach 1 1/2 lowering springs, Cobra R rims 17X9 with p235 on front and p275 on rear with Falken Zeix tires-RUNNING!

06-18-2003, 08:02 AM	#10
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	I'd say run it! Yeah, I have forged pistons but if I was in your position, I'd run N2O in increments and see what happens. Why not? If you are thinking about replacing your pistons, just drive it 'till you NEED to replace something. I wouldn't slap a 150 shot on right away, but a 75 is worth a go... good luck... __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

06-18-2003, 09:28 AM	#11
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	Thanks guys, the 150 shot was my mechanic gettin all excited after seein my NOS kit hes nuts but I really wanna stay N/A but I can also easily picture wanting a super charge more then NOS but its like I have the kit just sittin here so its like as mine as well spray and not waste it, the kit is still in the shrink wrap not even touched with a 10lb bottle __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

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