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#1 |
Registered Member
Join Date: Apr 2002
Location: Florida
Posts: 532
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![]() 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
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90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73 |
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#2 |
I got something to say
Join Date: Sep 2001
Location: San Diego, CA
Posts: 1,557
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![]() dont even bother with thew hypers. Especially with a 150 shot of nitrous they will not hold up.
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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 |
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#3 |
DURKA DURKA!!
Join Date: Sep 1997
Location: Lubbock, TX...(TX panhandle)
Posts: 1,418
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![]() 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
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'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 |
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#4 |
Registered Member
Join Date: Apr 2002
Location: Florida
Posts: 532
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![]() Well whats a decent set of forged internals out there, some brand names that wont cost me alot but are still good.
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90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73 |
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#5 |
Rebel Fleet Commander
Join Date: Oct 2001
Location: Huber Heights, OH
Posts: 1,003
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![]() 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
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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!" ![]() |
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#6 |
Registered Member
Join Date: Apr 2002
Location: Florida
Posts: 532
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![]() 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.
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90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73 |
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#7 |
Registered Member
Join Date: Feb 2002
Location: Jacksonville, FL
Posts: 706
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![]() I have flat-top TRW's and have no probs...compression is about 9.5-9.6 with TFS heads.
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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 |
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#8 |
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
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'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 |
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#9 |
Registered Member
Join Date: Sep 2002
Location: IL
Posts: 105
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![]() 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!
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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! |
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#10 |
Registered Member
Join Date: Feb 2002
Location: Jacksonville, FL
Posts: 706
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![]() 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...
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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 |
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#11 |
Registered Member
Join Date: Apr 2002
Location: Florida
Posts: 532
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![]() 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
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90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73 |
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