Engine combo... need some advice please

[fast70]

I'm not sure, but I think that the Scat kit uses a cast crank.

fast70

[super vw]

Originally Posted by fast70

I'm not sure, but I think that the Scat kit uses a cast crank.

fast70

I think is does aswell, is there any thing wrong with a cast crank? is the stock crank cast?

[fast70]

The stock crank is forged, because when Ferdinand was designing the engine they found that the cast cranks had the fault of snapping after spirited use. Therefore, since you said you want to use your car for Auto-X, I would stay away from the cast crank and buy a forged. From what I hear, CB Performance now makes 76mm forged cranks for the same cost as a 69mm. So for maximum displacement on a budget that is what I would go with.

fast70

[boygenius]

I think the stock crank is forged. The scat cast crank is supposed to be good for 5,500 rpm and 125hp.

[boygenius]

What is the biggest stroke crank you can run without clearancing the case???

[super vw]

Originally Posted by boygenius

What is the biggest stroke crank you can run without clearancing the case???

I think its the stock 69mm

[fast70]

The biggest without clearancing is 76mm although a 78 will fit with just minor clearancing. The stock crank is forged. To be safe, if you are comming anywhere near the HP threshold number, I would go with forged. It is cheap insurance. I have a friend who made the mistake of buying a cast crank and has had to have the crank turned down twice with only a couple thousand miles on the motor. So even though it is not that expensive to have turned:
1. It weakens the crank even farther
2. By the time the cost of the crank and cutting are added you have exceeded the cost of a forged crank.
3. Each time they need to be cut, the motor has to be torn down and new oversize bearings bought. So factor in the cost of a couple of sets of bearings.
4. You are taking unneccessary chances and stretching the rubber band to save a few bucks.

fast70

[super vw]

Originally Posted by fast70

The biggest without clearancing is 76mm although a 78 will fit with just minor clearancing. The stock crank is forged. To be safe, if you are comming anywhere near the HP threshold number, I would go with forged. It is cheap insurance. I have a friend who made the mistake of buying a cast crank and has had to have the crank turned down twice with only a couple thousand miles on the motor. So even though it is not that expensive to have turned:
1. It weakens the crank even farther
2. By the time the cost of the crank and cutting are added you have exceeded the cost of a forged crank.
3. Each time they need to be cut, the motor has to be torn down and new oversize bearings bought. So factor in the cost of a couple of sets of bearings.
4. You are taking unneccessary chances and stretching the rubber band to save a few bucks.

fast70

I totaly agree with you Fast70, it would be wise to invest in a strong backbone i guess. I just wasent to sure on the cast VS forged debate. but it makes sence to use the better product.
So spent a few hours looking around for parts, and there prices. i came up with a CB performance chromolly forged crank, its $189 bucks :S but its the cheapest i could find from a good name. it seams to have counter weight on it... but does not list that it is (well non of CB cranks say they are... so they all must be c/w considering they have counter weights in the pics :P)

For the full flow i looked at the CB "Maxi-5" oil pump. it has a Full flow outlet on its cover. After geting the pump with outlet, and the remote filter adaptor... what else is needed to complete the system (like what hoses, fittings work, and are not expensive)

Thanks!
Jonathan

[Eurolook71]

You can run up to a 76 crank without doing anything to the case, but the rods will need a little clearancing where the bolts are...or is that a 74???.... ... i know a 74 will fit for sure....


I would stay away form a cast crank like the plauge, but that's my opinion.
Its just extra insurance knowing the heart of your well balanced engine wont snap if you wanted to have a little fun.


Maybe wait a while till you can get a Scat Volkstroker 2 kits, (that cast crank is the volkstroker 3 kit)

These are more expensive but, well, in the end you have a more reliable crank....you got what you paid for.

For the VS 2 kit and full flow parts and pushrods, etc, etc...go to aircooled.net

They have a full-flow kit, with modified and blue-printed pump and everything you need for I think $130. Also, if you get your carbs here, they help you set them up with the right jets and stuff. Check it out....

I wanst aware that CBP was selling their 76 cranks for the same price as a 69....i'll have to check that out...I havent bought my new crank yet soo....

[super vw]

So is it SAFE to use a cast crank? i dont plan to go past 5500 rpm, but im sure i will have damn near 120hp once done