Need a little help from you guys,

I posted a while back about cracking a piston on a 502mpi Whipple engine. The mechanic is punching the block out to a 509 cid Whipple motor. I don't have the money for expensive heads, or bigger injectors. I know they make a couple of upgraded cams that help the Whipple out.

My mechanic has built regular blower motors, but I'm not sure about Whipple engines. He's going back with J.E. piston flat top with a 8.8 compression and the stock 118cc heads. Crane HP gold roller rockers. I have to send the ECU back to Dustin, but they need to know what kind of cam I will be using.

Any one upgraded their Whipple motor.? Sure could use some help on this. He's also going to give Dustin a call at Whipple.

Thanks,
Shawn

Or any recipes from someone that has already built one??

Dustin has tested many and should be the source especially since he's doing the ECU.
Don't re-invent the wheel
Good Luck,
Dave

TTT :d

Yeah flow the head and get the figures. Calculate boost. Max rpm for the engine to run and a cam can be figured. Custom stuff is the way to go if you want to maximize power.

Chris

I'm liking the sound of 800HP!! Have to see what it would cost to pocket port.

Thanks!

I just built similar motors. 509 flat tops 9.0-1 Crane 731 roller cam with roller rockers. Edelbrock marine aluminum heads with only the exhaust side opened up.Whipplecharged and intercooled. At 8 lbs boost it makes 775 hp at 5400. 850 ft lbs torque at 3800 At 6000 rpm it made 825 hp !!! but I don't want to run that high.

If you want a perfect setup then go with a custom grind cam as others have stated. I ran out of time when I decided to change cams so I went with off the shelf cams but they work well so far.

Smitty,

Do you happen to know what kind of difference there is between the stock heads and the Edelbrocks? Did you put a different set of injectors in or use the stock ones. I don't want to spin mine that high either. I'm looking for around 53 to 5400 RPM.

Does anyone know who has made a special grind cam for these Whipple motors?

I appreciate all the help and input on this!

I run stock injectors at 55 psi fed by an SX fuel pump. If you spend enough time on the stock heads you can get them to flow almost as good. I went to aluminum heads so that I could run 8 psi boost with a larger margin of safety.

You don't need a special grind for the Whipple. what you need is a cam that works in harmony with your selected heads, exhaust. Then you factor in how much total boost you will be running. Any time you increase the flow capabilities, the previous amount of boost will drop because of increased flow rates. I had to go down 3 sizes in pulleys to acheive desired boost.

try a place called cam motion for a custom cam. i do not have a number sorry

Thanks for the inut on this!!

If you could use bigger injectors but don't want to buy new ones, I have a set I ran in mine for about 60 hours that came from Tyler Crockett. They're take outs from an HP500 EFI, and they're blue!

I don't know if that would be a benefit in your case, over the ones you have but if you're interested, I've got them and won't be using them and could have them to you in a day (since we're both in Texas). Shoot me a PM if they'll work.

:ON EDIT:
Actually, if you're needing larger injectors, these nay be going the wrong way. I think the 454/502 MAG injectors ar 40 lb and the HP 500 are 36 lb. (different pulse width??) Dustin will know if they'll work better or not!