valve spring ?

[97babyXJ]

does anyone know the stock specs on the 97 4.0 valve springs? prefer the seat pressure and open pressure?
thanks guys!
ryan

 

[97babyXJ]

ill change my questions here a little, im running a crane cam p# 953901 almost identical to the 953905, is anyone running these cams. im trying to figure out my valve spring and retainer issue. what springs and retainers are you guys using with these cams? or similiar cams too!
thanks
i need to get this thing back together

 

[Frank Z]

I had issues trying to get the proper springs and retainers from Crane when I built my stroker. My machinest recommended SBC springs and retainers. The cylinder head needed to be spot-faced but not that much. IIRC the spring pressure was somewhere in the neighborhood of 110-150 LBS.

 

[97babyXJ]

yeh see thats a bit to high for what im lookin for, crane has some springs, i think there about 98lbs at seat. but i cant seem to find proper retainers for them, they are bigger than stock, so stock retainers will not fit.

 

[Dr. Dyno]

does anyone know the stock specs on the 97 4.0 valve springs? prefer the seat pressure and open pressure?
thanks guys!
ryan

Stock spring pressure is 85psi closed and 200psi at 0.424" of valve lift. The retainers are 1.31" diameter.
I used Mopar Performance P5249464 valve springs when I had the Crane 753905 cam in my stroker. Their pressures are about 40% higher than stock.

 

[Flash]

Stock spring pressure is 85psi closed and 200psi at 0.424" of valve lift. The retainers are 1.31" diameter.
I used Mopar Performance P5249464 valve springs when I had the Crane 753905 cam in my stroker. Their pressures are about 40% higher than stock.

So, are you still running the same P5249464 springs with you stock cam or did you go back to the stock springs?

Flash

 

[jeepinwi]

I don't mean to speak for dino, but I'm pretty sure he went back to the stock valve springs with the stock cam. There's no need for the HD springs with the stock cam. All the HD springs would do is accelerate wear of the cam and lifters.

 

[97babyXJ]

those mopar springs are just gona be to stiff for my taste, has anyone ever used crane's spring 99833?

please i need to get this head back together

 

[Dr. Dyno]

I don't mean to speak for dino, but I'm pretty sure he went back to the stock valve springs with the stock cam.

Indeed I did.
97babyXJ, you might wanna use the stock valve springs initially to break in the new cam. You can switch to stiffer springs later (the Mopar springs that I used are almost identical stiffness to the springs Crane recommends for their 753905 cam). You'll also want to use a high zinc oil such as Shell Rotella to reduce the risk of premature cam lobe/lifter wear. I did mention earlier

when I had the Crane 753905 cam in my stroker

because one lobe and two lifters (all on no.6 cylinder) bit the dust after 34000 miles. At the time, I didn't know that the Mobil 1 that I'd been using could contribute to cam lobe/lifter wear by having too little zinc, and I also used the Mopar springs from the outset including the cam break-in so that might not have helped either.

 

[Flash]

Indeed I did.
97babyXJ, you might wanna use the stock valve springs initially to break in the new cam. You can switch to stiffer springs later (the Mopar springs that I used are almost identical stiffness to the springs Crane recommends for their 753905 cam). You'll also want to use a high zinc oil such as Shell Rotella to reduce the risk of premature cam lobe/lifter wear. I did mention earlier because one lobe and two lifters (all on no.6 cylinder) bit the dust after 34000 miles. At the time, I didn't know that the Mobil 1 that I'd been using could contribute to cam lobe/lifter wear by having too little zinc, and I also used the Mopar springs from the outset including the cam break-in so that might not have helped either.

I asked because i can't help but wonder how much of a bigger can could, you could get a way with, with stock spring..................I mean, these 4.0L just don't rev that high (safely). Just curious if a stock spring(in good condition) wouldn't hold up, too.........well even a large cam such as the Crane 753905.
I wonder if there would be a spring bind issue with the taller lift................

I sure would be more comfortable with this new oil claaaaaaaaaaaaaaaaaaass of oil that has been forced upon us. If we could get a way with the stock spring on a HP cam.

So if any one is putting a HP ( performance aftermarket cam) cam in there 4.0L, run it with the stock spring (Cam will brake in better with less chance of failure) and see if it will float or cause a miss at top (Stock) RPM (after the cam is broke in and before you put the stiffer spring in.

Just thinking out loud here.

Flash.

 

[jeepinwi]

Flash-
I'm running the Crane 753905 cam with stock valve springs in my stroker. I have a set of the HD mopar springs I've decided not to use because of the increased wear. Dino has advised me that my setup could be run up to about 4800 rpm's safely. The highest I've taken my motor was up to about 4800 rpm;s, and the power delivery seemed smooth. I could probably run the engine higher considering my POS crane cam is probably worn and doesn't have its original amount of lift anymore.:smsoap:

I'll also add that my engine runs fine being limited to 4800 rpm's because my 60mm TB and OEM exhaust severely choke off power up top.

 

[Flash]

Flash-
I'm running the Crane 753905 cam with stock valve springs in my stroker. I have a set of the HD mopar springs I've decided not to use because of the increased wear. Dino has advised me that my setup could be run up to about 4800 rpm's safely. The highest I've taken my motor was up to about 4800 rpm;s, and the power delivery seemed smooth. I could probably run the engine higher considering my POS crane cam is probably worn and doesn't have its original amount of lift anymore.:smsoap:

I'll also add that my engine runs fine being limited to 4800 rpm's because my 60mm TB and OEM exhaust severely choke off power up top.

Cool!!!!! That is what i was hoping some one would tell me

Thanks
Flash