Weak Link

[SMOKDU]

I have been into making more horse power in boosted fords for over 10 years and I know over time what parts will break. Most the time it was a bad tune or too much timing that breaks parts and that is why over the years we added stronger rods, pistons and rings, changed to head studs and stronger blocks, metal head gaskets, upgraded valve train parts, stronger cranks, drive shafts, rear gears, axles, the list goes on and on.

I have a 4.0 whipple on a stock block with the usual adds for fuel upgrades and axle bolts what is the weak link in our motors. How much boost in a supercharged application can these motors take. Turbo's do not rob power from the motor that's why I am looking at supercharger combos. I know fuel and timing is a big part in an engine living and staying together. If the tune was good what is the limit before changing parts like list said above in quotes. We had some better parts because we ran on the edge boost and timing and A/F numbers and if we missed the tune a little it lived so we could retune the next pass. I did not see any info looking back so thx. WHAT IS THE LIMIT..(IF WE HADA BIG ENOUGH FUEL SYSTEM) .ON STOCK PARTS AND WHAT SHOULD WE BE CAREFUL OF..

 

[1434gt]

I have heard in the past that the crank need to be double keyed in order to live under the 4.0,i don't know exactly how true that is

 

[CanadaGT]

I have 60000 miles on my car and the last 40000 miles have had a 4 litre whipple and Ford racing headers and exhaust. Hard on rear tires, Dynoed 770 RWHP at 28000 miles and last fall dynoed 648 RWHP Have a 19 lb pulley and total boost is 20 psi, No real world issues other than tires and routine services.

 

[SMOKDU]

I have 60000 miles on my car and the last 40000 miles have had a 4 litre whipple and Ford racing headers and exhaust. Hard on rear tires, Dynoed 770 RWHP at 28000 miles and last fall dynoed 648 RWHP Have a 19 lb pulley and total boost is 20 psi, No real world issues other than tires and routine services.

Same dyno? Why the drop in HP.

 

[BlackICE]

Same dyno? Why the drop in HP.

+1

 

[CanadaGT]

Different Dyno and I never prepped the car. eg new plugs etc etc. Blew the Borla muffler apart at the seams, is the only issue I have had with this set up.

 

[SMOKDU]

Different Dyno and I never prepped the car. eg new plugs etc etc. Blew the Borla muffler apart at the seams, is the only issue I have had with this set up.

Thx for the response . Some dynos can read different number but I would buy some 130 hp plugs if I was you.:thumbsup

What is the rpm limit on these motors before spitting out a rod. I know some cars had major failures in the mile run and I think a dual supercharger/blower combo let go. What parts went wrong? Was it Tune related or parts ? Also what rpm can the valve train support ? Sorry for so many questions but someday I want a 1000 hp blower combo.

 

[PeteK]

On the same subject, did the GT engines have forged or cast cranks? I read in the one of the spec books that most of the 5.4 engines were cast cranks, but there were forged cranks in some applications (like maybe the GT?).

 

[BlackICE]

On the same subject, did the GT engines have forged or cast cranks? I read in the one of the spec books that most of the 5.4 engines were cast cranks, but there were forged cranks in some applications (like maybe the GT?).

Forged in the FGT, probably they were writing of the ones in the F150s.

 

[SMOKDU]

Forged in the FGT, probably they were writing of the ones in the F150s.

Ok so maybe we should talk about all the strong links instead .

1 forged crank. Thx rated for ? HP

 

[BlackICE]

Ok so maybe we should talk about all the strong links instead .

1 forged crank. Thx rated for ? HP

HP? How about RPM and torque?

I don't know of any motors much over 1000 HP without a built motor, 1100 tops with TT. So with a blower I would deduct at least 100 HP, so about 900 HP without a built motor. I don't know if the motor will last, only that some have pushed stock blocks to that level.

 

[SMOKDU]

HP? How about RPM and torque?

I don't know of any motors much over 1000 HP without a built motor, 1100 tops with TT. So with a blower I would deduct at least 100 HP, so about 900 HP without a built motor. I don't know if the motor will last, only that some have pushed stock blocks to that level.

Ok thx maybe I should go another angle. What did they change in the built motors to handle more power. That might be a good start to what they thought was the weaker parts. Thx if someone asked me about a stock pushrod small block ford I could rattle off what you would need to change to handle 1000 plus blower power. I would think the whipple takes 200 hp just a guess. Also who would be a good engine builder for the ford 5.4

 

[bonehead]

Ok thx maybe I should go another angle. What did they change in the built motors to handle more power. That might be a good start to what they thought was the weaker parts. Thx if someone asked me about a stock pushrod small block ford I could rattle off what you would need to change to handle 1000 plus blower power. I would think the whipple takes 200 hp just a guess. Also who would be a good engine builder for the ford 5.4

Easy answer to the last question. John Mihovetz/Accufab

 

[SMOKDU]

Ok thx I will contact him for info. I'm sure he will have some good ideas. Anyone else worth looking at, I have a real good guy but I think we just does pushrod ford motors. He build me a 7 sec blower motor 4 years ago. It was a beast,

 

[bonehead]

Ok thx I will contact him for info. I'm sure he will have some good ideas. Anyone else worth looking at, I have a real good guy but I think we just does pushrod ford motors. He build me a 7 sec blower motor 4 years ago. It was a beast,

I would also look at Mark Heidaker's engine builder, Kevin Kesterson. They obviously know what they're doing as well.

 

[BlackICE]

Bonehead has some great advice. Those guys have built the fastest mile cars in the world!

Most here doubt the record, but another guy in FL hold the Guinness mile record in a FGT and would be a 3rd source for answers, but I would try the other 2 first. :lol

 

[B.M.F.]

Billet crank, billet i beam rods and a killer set of pistons. On the heads we do better wider seats, new valves, springs and guides along with porting.

Mihovetz does Marks mile motor. John is a very smart fellow and is doing mullets new motor also...

Tim @ mpr race engines in fl does Jonny Boehmers motors. He also just did the machine work on my short block and has been doing a ton of the fast Gt500 motors out there. He will be doing my other two short blocks also. I install heads and degree the cams up here. He is very maticulate, has very nice equipment and is very thorough . He is also very reasonable for what he does.

L&m would be another choice up in the east coast.

Those are the only 3 people i would recommend off the top of my head.

 

[SMOKDU]

Dan thx I just called my engine guy that Jason recommended back when I had a 7 sec blower combo. Great guy and I know his combo worked because I picked up almost a whole second in the 1/4 mile and it lived. My car is running great and I almost don't want to do anything but I would rather be proactive . Then I can go procharger.