All Motor Chat - High Gearing, Light weight, Revin to the moon-

[marcspaz]

.....Also, with the addition of VCT aren't you increasing the amount of HP and torque that the engine will make?

Only in low RPM's when the oil pressure is low. In higher rpm's the cams are already pushed into place that they get locked out at if you were to lock at full advance. The cams only change with oil pressure. Once you reach full advance, it stays there until the oil pressure drops.

It was under my assumption that by locking the cams you are loosing both HP and torque, not just one or the other...

This may be true in some cases, but not all. HP is a calculation of TQ and RPM. You can have a loss in TQ but still be gaining HP if the RPM's are climbing fast enough. This is why most define it as a loss of TQ, not HP.

...and by putting in limiters you are limiting the amount that the cam is able to rotate and loosing a little or maintaining the amount of HP and torque that the engine makes. Is that accurate? I don't mean to sound like a dick if I am coming across that way, just trying to learn.

That is a confusing question. LOL The purpose of the VCT limiters is to limit the amount of mechanical advance/retard in the cams to prevent valve/piston impact. I don't think you will "feel" and may barely be able to measure the difference between limited and locked when tuned optimally.

I always recommend lockouts. Beats having to spend another 5 to 10 grand on heads or a long block because the limiters didn't limit enough.

I see what your saying. I may do an oil pump just for peace of mind and it will help me when I do take the next step with the build eventually.

Sure. I mean I didn't... but that doesn't mean you can't or shouldn't. I was simply pointing when I would see mechanical justification for it. Nothing wrong with installing a better oil pump. Sometimes piece of mind is a better justification then any mechanical excuse we can see. LOL

 

[Matt D]

I ran the full lock out's on my old 3V combo aswell on my 127500 cam set up. Like Marc is saying you won't even notice the hp difference for the power you will be making. Running the Melling billet pump's also don't support the Vct.

Full lock outs, Billet oil pump, big cams, Frpp / Jpc intake & ported heads and watch the 60+ Hp gains on a stock bottom end.

 

[Mike K]

I'm hoping for around 360 without porting the heads (not in the budget). I have full bolt ons besides intake manifold and throttle body.

Thanks for the clarification on the lockouts vs limiters.

 

[ArtQ]

I ran the full lock out's on my old 3V combo aswell on my 127500 cam set up. Like Marc is saying you won't even notice the hp difference for the power you will be making. Running the Melling billet pump's also don't support the Vct.

Full lock outs, Billet oil pump, big cams, Frpp / Jpc intake & ported heads and watch the 60+ Hp gains on a stock bottom end.

For what it's worth I run limiters and rev between 6800 and 7200 on a regular basis with 127500's...No troubles..100's of track runs

I would however feel better with TSS oil pump gears and 2V tensioners...I'll get to it

 

[Matt D]

Ceramic anyone?

 

[Mike K]

And how much weight are you saving with those?

 

[Matt D]

It's not the gross weight that really matters (they are a bit lighter). It's the 1/10th less rolling resistance that the ceramic bearings have over a normal bearing. Front hubs, Axle bearings, Pinion bearing, Carrier bearings etc. As a combo of everything would be a massive difference

Unfortuntly they are a million dollars

 

[killermustang]

Who makes them

 

[Matt D]

Performancebearing.com

 

[rcm90]

1k for a set of hubs!?!?

 

[Mike K]

Got to pay to play!

 

[rcm90]

I know, but didn't expect them to be that much.

 

[Matt D]

Yea... I priced them out in the summer and fell off my chair lol. To do the rear end will be another $1200+ bucks

 

[Matt D]

Pro Stock tricks lol. It all comes into effect when pushing that envelope for record breaking et's

 

[ford20]

Does anyone see any benefits from the Big Bore shortblock that Livernois offers? I know I don't know a lot about this stuff but does the extra .38 bore size make a big difference?

http://www.livernoismotorsports.com...Bore-Pro-Series-Shortblock-(10:1,11.5:1).html

 

[ford20]

Bump

 

[rcm90]

Increasing bore size will un shroud the valves resulting in better head flow and you will gain torque from the displacement increase.

 

[gil_t2]

If you needed to buy a new motor, why would you not want more C.I. ?

 

[rcm90]

You might not want to stroke it if your going to turn high rpm's due to piston speeds being raised.

Most of the serious modular drag racers leave it at stock cubes or close to stock CID and just raise compression and boost.

 

[ford20]

You might not want to stroke it if your going to turn high rpm's due to piston speeds being raised.

Most of the serious modular drag racers leave it at stock cubes or close to stock CID and just raise compression and boost.

That's the deal, with the Cobra Jet IM you need to spin the motor high to utilize the power that it makes and with a stroker motor I would be concerned with just that and the geometry of the piston being thrown off with the engine running that high. If that makes any sense at all.

I know I have seen here a million times that it is better to have the bigger bore then a longer stroke and I was just curious if the extra .34 on the bore is really going to make a difference since Ford Racing uses Livernois to do the same thing on the N/A Cobra Jet blocks.