5.0 Stock Bottom End Strength

CokerGT · August 25th, 2010, 05:09 PM

Hey guys, I was just curious if anyone knows how much the stock rotating assembly and block of a 5.0 can handle. I think I remember over 400rwhp is pushing it. What about rpm's? I have heard anything over 6,500 rpm's is too much strain on the motor. What do you think?

walt1120 · August 25th, 2010, 05:12 PM

Originally Posted by CokerGT

Hey guys, I was just curious if anyone knows how much the stock rotating assembly and block of a 5.0 can handle. I think I remember over 400rwhp is pushing it. What about rpm's? I have heard anything over 6,500 rpm's is too much strain on the motor. What do you think?

are you talkin about a new 5.0..?

JBIGBOOTSY · August 25th, 2010, 05:14 PM

big torque, or big rpm, or any combo of the two. I've seen a 270hp motor split, and have heard of people getting up to 700, im sure it all depends on the condition of the motor.

CokerGT · August 25th, 2010, 05:20 PM

I was refering to the fox body 5.0's. I was curious on the potential of the stock assembly w/o anything forged steel or modified.

69fastback · August 25th, 2010, 05:25 PM

Originally Posted by JBIGBOOTSY

big torque, or big rpm, or any combo of the two. I've seen a 270hp motor split, and have heard of people getting up to 700, im sure it all depends on the condition of the motor.

Something was terribly wrong with a motor that split at 270hp.

Jobra · August 25th, 2010, 05:40 PM

500 RWHP max.

CokerGT · August 25th, 2010, 06:08 PM

What about a max rpm that can be acheived safely w/o engine damage? Or simply put, what would be over-spinning it?

93mustank · August 25th, 2010, 06:11 PM

Depends...not a set number...

DigitalDC89 · August 25th, 2010, 06:17 PM

this may not be true, but i read that the engine can spin up to 6k safely, but the stock valves will start to float around 5k due to the weak factory springs. any truth to that?

CokerGT · August 25th, 2010, 06:23 PM

Not over-spinning it for hp or shift points, rather the highest rpm that can be acheived w/o causing damage or running a heavy risk of destroying a motor all together. Kind of like a "DO NOT GO PAST THIS ENGINE SPEED" rule of thumb. I know the Ford Racing X and Z cams make power up to 6,500 rpm's. Is that a bit too much for the stock rotating assembly? Again, I am just curious on how much these little shortblocks can handle.

FastStang91Lx · August 25th, 2010, 07:27 PM

Originally Posted by 69fastback

Something was terribly wrong with a motor that split at 270hp.

Bad balance???

Originally Posted by 93mustank

Depends...not a set number...

This is the most true statement... Every motor is different. I could say 500, but you could easily break at 4. I repeat... EVERY MOTOR IS DIFFERENT. The balance has a lot to do with it too.

CokerGT · August 25th, 2010, 07:42 PM

Yeah, I agree. I know balance of the crank and condition of the engine play large roles in engine durability when racing. Still, if you had lets say, H/C/I on a well balanced motor that was running optimal with a strong valvetrain, would it be safe to take the stock bottom end components to 6,500 if the motor made peak power there? When is it a good time to upgrade the crank, rods, and pistons?

89lx · August 25th, 2010, 08:10 PM

i beat on mine all day and its still going. first time ever to the track and i ran a best of 12.4 out of 3 passes and i make 296 to the wheels. ive also seen the tac go well above 6. mind you i dont care if this engine takes a shit

FastStang91Lx · August 25th, 2010, 08:25 PM

Stock rev limiter is 6250 rpms, so you don't have too much worry there. The only way to rectify that is with a chip removing it. Stock tachs are not accurate at all. I hit 6250 in my car when the tach says 7.

CokerGT · August 25th, 2010, 08:39 PM

Yeah, I hear ya'. The stock tach. has a mind of it's own. Sometimes I have actually seen my needle hesitate when downshifting. So, does every fox body 5.0 have a built in rev limiter at 6,250? I have a MSD 6AL w/a 6,200 pill, so I have never seen it go off.

fogged306 · August 25th, 2010, 08:46 PM

Every EFI fox does. At 6250, the computer pulls fuel.

89lx · August 25th, 2010, 08:55 PM

Originally Posted by FastStang91Lx

Stock rev limiter is 6250 rpms, so you don't have too much worry there. The only way to rectify that is with a chip removing it. Stock tachs are not accurate at all. I hit 6250 in my car when the tach says 7.

not going by the stock tach and the limiter is gone

CokerGT · August 25th, 2010, 09:24 PM

Originally Posted by 89lx

not going by the stock tach and the limiter is gone

Do you mean what if a 5.0 Mustang had an aftermarket tach. and the stock limiter was tuned out? I am still interested as well. Is there anyone out there running a stock bottom end and running numbers past 6,250 rpm?

92Notch · August 25th, 2010, 10:46 PM

Originally Posted by CokerGT

Do you mean what if a 5.0 Mustang had an aftermarket tach. and the stock limiter was tuned out? I am still interested as well. Is there anyone out there running a stock bottom end and running numbers past 6,250 rpm?

Maybe a member "E3 SEAN" He runs basement 10's with the stock block if I'm not mistaken. He prbly spins it up to about that if not more

89lx · August 26th, 2010, 06:21 AM

Originally Posted by CokerGT

Do you mean what if a 5.0 Mustang had an aftermarket tach. and the stock limiter was tuned out? I am still interested as well. Is there anyone out there running a stock bottom end and running numbers past 6,250 rpm?

i have an aftermarket tac and have spun it abouve but its not making and power

August 25th, 2010, 05:09 PM	#1
CokerGT Newbie Join Date: Aug 2010 Posts: 11 iTrader: 0 reviews	5.0 Stock Bottom End Strength Hey guys, I was just curious if anyone knows how much the stock rotating assembly and block of a 5.0 can handle. I think I remember over 400rwhp is pushing it. What about rpm's? I have heard anything over 6,500 rpm's is too much strain on the motor. What do you think?

August 25th, 2010, 05:14 PM	#3
JBIGBOOTSY MM Fanatic 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 4,402 iTrader: 0 reviews	big torque, or big rpm, or any combo of the two. I've seen a 270hp motor split, and have heard of people getting up to 700, im sure it all depends on the condition of the motor. __________________ Bolt-on Abraham Lincoln Log motor. With extra wiring.

August 25th, 2010, 05:40 PM	#6
Jobra Hardcore Enthusiast 2004 Cobra 11.4 @ 129 - Need cage Join Date: Jan 2009 Location: MA Posts: 2,115 iTrader: 1 reviews	500 RWHP max. __________________ NEW NUMBERS: 609/543

August 25th, 2010, 06:11 PM	#8
93mustank Banned Join Date: Aug 2008 Location: Phoenix,AZ Posts: 3,014 iTrader: 1 reviews	Depends...not a set number... __________________ PeteAndersonRacing.com

August 25th, 2010, 06:17 PM	#9
DigitalDC89 Enthusiast '88 Mustang GT Join Date: Apr 2010 Location: Allentown, PA Posts: 509 iTrader: 0 reviews	this may not be true, but i read that the engine can spin up to 6k safely, but the stock valves will start to float around 5k due to the weak factory springs. any truth to that? __________________ '02 Mustang GTm Convertible - N/A Almost Cammed Daily - 13.55 @ 100.7 1.955 60' '88 Mustang GTm - 1/4 Mile Build - 750rwhp Project '97 Saturn SL2m - Ex-Nitrous Build - Back-Up Daily

August 25th, 2010, 05:20 PM	#4
CokerGT Newbie Join Date: Aug 2010 Posts: 11 iTrader: 0 reviews	I was refering to the fox body 5.0's. I was curious on the potential of the stock assembly w/o anything forged steel or modified.

August 25th, 2010, 06:08 PM	#7
CokerGT Newbie Join Date: Aug 2010 Posts: 11 iTrader: 0 reviews	What about a max rpm that can be acheived safely w/o engine damage? Or simply put, what would be over-spinning it?

August 25th, 2010, 06:23 PM	#10
CokerGT Newbie Join Date: Aug 2010 Posts: 11 iTrader: 0 reviews	Not over-spinning it for hp or shift points, rather the highest rpm that can be acheived w/o causing damage or running a heavy risk of destroying a motor all together. Kind of like a "DO NOT GO PAST THIS ENGINE SPEED" rule of thumb. I know the Ford Racing X and Z cams make power up to 6,500 rpm's. Is that a bit too much for the stock rotating assembly? Again, I am just curious on how much these little shortblocks can handle.

August 25th, 2010, 07:42 PM	#12
CokerGT Newbie Join Date: Aug 2010 Posts: 11 iTrader: 0 reviews	Yeah, I agree. I know balance of the crank and condition of the engine play large roles in engine durability when racing. Still, if you had lets say, H/C/I on a well balanced motor that was running optimal with a strong valvetrain, would it be safe to take the stock bottom end components to 6,500 if the motor made peak power there? When is it a good time to upgrade the crank, rods, and pistons?

August 25th, 2010, 08:10 PM	#13
89lx Regular 1989 LX coupe 5.0L Join Date: Dec 2007 Location: NS Canada Posts: 496 iTrader: 0 reviews	i beat on mine all day and its still going. first time ever to the track and i ran a best of 12.4 out of 3 passes and i make 296 to the wheels. ive also seen the tac go well above 6. mind you i dont care if this engine takes a shit __________________

August 25th, 2010, 08:25 PM	#14
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 6,990 iTrader: 2 reviews	Stock rev limiter is 6250 rpms, so you don't have too much worry there. The only way to rectify that is with a chip removing it. Stock tachs are not accurate at all. I hit 6250 in my car when the tach says 7. __________________ FastStang's Ongoing projects thread Click here!

August 25th, 2010, 08:39 PM	#15
CokerGT Newbie Join Date: Aug 2010 Posts: 11 iTrader: 0 reviews	Yeah, I hear ya'. The stock tach. has a mind of it's own. Sometimes I have actually seen my needle hesitate when downshifting. So, does every fox body 5.0 have a built in rev limiter at 6,250? I have a MSD 6AL w/a 6,200 pill, so I have never seen it go off. Last edited by CokerGT; August 25th, 2010 at 08:42 PM.

August 25th, 2010, 08:46 PM	#16
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	Every EFI fox does. At 6250, the computer pulls fuel.

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