In the 80's and early 90's mustangs with the 302's when did they switch to hyper. pistons? Also, which pistons would stand up to NOS the best and how big of a shot could be used without blowing it up?
Brett
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'91 Ford Ranger std. cab 5-speed OD 2.3l
On the 5.0 motor the rod bolts are the weak link for high rpm and power adder apps, but that said the stock rotating assembly seems to reliable up to around the 400hp range.
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Paul O
1990 F150 4x4 XLT X-Cab 5.0, 3.55, Comp 35-349-8, Flowtech LT's to 3" single, FRPP Mass Air Conversion
Under construction: '85 351HO, Dart Iron Eagles, 1.6 RR, Typhoon intake, Crane 444232, 24lb Injectors, TweecerRT, Innovate LC-1 wideband O2
1990 Ranger 2wd, 2.3 Briggs & Stratten, 5-speed, 3.08 gears, and now power steering!!
I think it sucks the weakest link in most engines are the rods.
I had a 490-510 horsepower (crank) highly modified twin turbo (upgraded 15G turbos) Stealth R/T TT. Ross forged pistons. Aftermarket forged steel crank (came with a cast iron crank).
Stupid part on my part was the stock rods I left in there. Spun a bearing 3 times, threw a rod through two blocks. Was a few years back, I learned a lesson there. You can have the best crank and pistons in the world, but the rods are the weakest link if you aren't careful.
__________________ 1986 F-150 5.0 EFI XLT Lariat 4x4 NP435/NP208/9" 3.50
"Custom Exhaust" and leaf spring overloads
31x10.50 15" Nothing special, but it's a damn good truck.
On the 5.0 motor the rod bolts are the weak link for high rpm and power adder apps, but that said the stock rotating assembly seems to reliable up to around the 400hp range.
..Are the rods ok or is it just the bolts ?? I guess a set of ARP rod bolts would be a good up grade... Lew
Yes ARP bolts are the fix.. though by the time you buy the bolts, have the old ones pressed out.. new ones pressed in.. and the rods true'd again, you could have bought an aftermarket set with ARP fasteners installed.
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Paul O
1990 F150 4x4 XLT X-Cab 5.0, 3.55, Comp 35-349-8, Flowtech LT's to 3" single, FRPP Mass Air Conversion
Under construction: '85 351HO, Dart Iron Eagles, 1.6 RR, Typhoon intake, Crane 444232, 24lb Injectors, TweecerRT, Innovate LC-1 wideband O2
1990 Ranger 2wd, 2.3 Briggs & Stratten, 5-speed, 3.08 gears, and now power steering!!
So, somewhat off subject, but what do you think the limit is for my stock '86 EFI 302? I do know it pulls to 5000RPM and can pull farther, but I never take it passed there. Is 5000RPM too high? Just curious, I know it doesn't mean much.
I know 5.0's are great revving motors with the 3" stroke, so can the stock rods and bolts take 5k RPM pretty easy?
__________________ 1986 F-150 5.0 EFI XLT Lariat 4x4 NP435/NP208/9" 3.50
"Custom Exhaust" and leaf spring overloads
31x10.50 15" Nothing special, but it's a damn good truck.
Yeah 5k is no problem.... 6k+ is when things get hairy. I'll add that with an all stock '86 truck motor you're really just making noise reving it that high, the whole powerband is below 4000rpm.
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Paul O
1990 F150 4x4 XLT X-Cab 5.0, 3.55, Comp 35-349-8, Flowtech LT's to 3" single, FRPP Mass Air Conversion
Under construction: '85 351HO, Dart Iron Eagles, 1.6 RR, Typhoon intake, Crane 444232, 24lb Injectors, TweecerRT, Innovate LC-1 wideband O2
1990 Ranger 2wd, 2.3 Briggs & Stratten, 5-speed, 3.08 gears, and now power steering!!
Yeah 5k is no problem.... 6k+ is when things get hairy. I'll add that with an all stock '86 truck motor you're really just making noise reving it that high, the whole powerband is below 4000rpm.
According to specs and a few other people on the board, that is true. I'll make a vid, though, it pulls harder up to 5k RPM, and would pull farther, but I'm 'scared'. Off subject again, but when I used to use Castrol GTX 10W-30, 5k would die off in power, then I tried GTX 10W-40 for one oil change, and it died in power around 4700RPM (yes, I watch closely). I went back to 10W-30... but now all year I've been running Rotella-T Synthetic 5W-40, and I don't notice a difference except that 5K RPM is not a 'wall' anymore. It wants to go on. I'm sure the engine is stock, though, but I'll have to take a picture/vid for you guys showing it pulling to 5K in 3rd (NP435) doing over 65MPH. It really winds out.
__________________ 1986 F-150 5.0 EFI XLT Lariat 4x4 NP435/NP208/9" 3.50
"Custom Exhaust" and leaf spring overloads
31x10.50 15" Nothing special, but it's a damn good truck.
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