541 cubic inch FE drag and drive

[My427stang]

What would be the benefit of a 4.0 crank than just using a 428 3.98 arm. Besides cubic inches.

I'll take a stab...10K RPM on a cast crank at those power levels may not end well

[CaptCobrajet]

Exactly right, Ross.  The cast crank wouldn’t make it.  The narrow 2.438 journal size wouldn’t either.  We found ways to make the FE journal live to 8500 when we had to, but even there, not those power levels.  The 2-inch is size of choice for me.  The 1.888 Honda at that power level won’t make many runs before service.  There isn’t enough load bearing surface area at that power.  The Honda is good at 800-900hp.  The 2-inch is more durable past that.  On the stroke, the piston speed would be a problem at 10K rpm.  The stroke eventually becomes a parasite when you swing the mass faster and faster.  Comp Eliminator guys have had success with a 4-inch stroke, so it is doable.  You won’t find long strokes in Pro Stockers……They make the bore as big as possible, and plug in the stroke number to make 500 inches.

The 800 inch mountain motors don’t rpm like the 500 inch ones do.🙂

For most purposes the FE journal, or the normal 2.200 that is common to the stroker cranks is just fine.  I’m doing a twin turbo 400 inch FE for myself.  Not a super high revving engine.  I prefer the 2.200 in this case, for the wide bearing and generally available “boost” tolerable shelf rods.  We want to make 1000 hp below 6500 rpm with .550 max lift, so it can drive anywhere.  Still debating draw through carbs with water-meth versus port injection with an intercooler.  The latter will probably prevail, but the carbs would be much less complicated for a Holley carb guy.  Okay….. am getting off the subject….

[Stangman]

I understand but I wasn’t talking about a stock crank. I thought when scat makes them you can get them as a steel crank and they were the same 2.20 journals as the 4.250 cranks. That being said I understand what you are saying.

When you got off the subject with the 400 inch boost motor a lot of guys around here are running blow through carbs with procharger. My buddy a few houses down (Chevy 540) makes 638 naturally aspirated with 600 lbs torque with procharger he makes 1070 Hp and 1247 lbs of torque. Makes me want one maybe next setup.

[My427stang]

I understand but I wasn’t talking about a stock crank. I thought when scat makes them you can get them as a steel crank and they were the same 2.20 journals as the 4.250 cranks. That being said I understand what you are saying.

When you got off the subject with the 400 inch boost motor a lot of guys around here are running blow through carbs with procharger. My buddy a few houses down (Chevy 540) makes 638 naturally aspirated with 600 lbs torque with procharger he makes 1070 Hp and 1247 lbs of torque. Makes me want one maybe next setup.

I was only teasing...

Boost is fun, we did a 347 2 years ago or so, 585 HP on 8 lbs of boost, sounded like a Granada at idle, HP curve looked like a steep mountain.  Would have made more if we spun the blower faster, but we were afraid of the block splitting in two!

[Stangman]

No sweat I’m not that thin skinned. But really if you get a 3.98 from scat they are 2.20 rod journal right.? There’s a guy around the neighborhood has like a notchback with a 347 I don’t know what kind of block he has but he runs 12 psi with a procharger she scoots along pretty good. That’s why I was saying maybe Blair will keep us informed on his 400 cube motor

[My427stang]

No SCATs 3.98 have FE rod bearings. I wish they did have that option to use a better bearing and longer rod, or at least an FE I beam to get some weight down on the cast crank builds

[blykins]

They are available from Scat in a custom. 

[frnkeore]

You can get a 410 CID engine, using a 361, steel FT crank and a SBC journal. 4.13 x 3.83