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Author Topic: crankshaft options  (Read 9356 times)

Ponti

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crankshaft options
« on: March 12, 2015, 03:19:30 AM »
Hi Matt.
 Could you help me. I'm starting to gather parts to build a blowen SBC 140" slingshot.
 I've been looking round for cranks and I've seen loads.
 One suggestion was to get a SBC crank with a BBC snout. Do I really need it?
 I know that whatever I get will need to be double keywayed.
 If it is better to go for one with the bigger snout which is best? The other problem with it is I've not seen a timing chain set that would fit, or am I missing stuff.
 Hope you can help, I'm probably overthinking or just confusing myself.
Cheers
Andrew
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dreracecar

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Re: crankshaft options
« Reply #1 on: March 12, 2015, 09:01:46 AM »
The BBC snout is the premier solution and have been running the same crank and hub and gear drive for the last 20 years,
 Second would be the stock dia snout with the ATI crank hub w/ BBC seal dia and a crank support
 Third (at minimum) would be the stock crank and ATI hub and check the hub retaining bolt frequently

  The stock crank needs the snout to be 1.25" longer to be reliable without the crank support and if you use a hub using the SBC seal dia, there is not enough material left from the keyways to the seal surface and the belt load splits the hub and rolls the key out of the crank. This wasnt a cheap hub either, it was the the top of the line RCD units and have seen 3 of these split.
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Offline dusterdave173

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Re: crankshaft options
« Reply #2 on: March 12, 2015, 09:17:40 AM »
Got a part number on that ATI hub? Is it the same hub they use on their dampers? Thanks
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Offline George

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Re: crankshaft options
« Reply #3 on: March 12, 2015, 10:55:04 AM »
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Ponti

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Re: crankshaft options
« Reply #4 on: March 12, 2015, 12:01:31 PM »
Cheers guys.

Who makes cranks with the BBC snout?

 And what about timing chain and gears? As obviously a standard SBC set won't fit.
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dreracecar

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Re: crankshaft options
« Reply #5 on: March 12, 2015, 02:51:18 PM »
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dreracecar

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Re: crankshaft options
« Reply #6 on: March 12, 2015, 02:53:02 PM »
Velasco did mine $3000
I know that Crower makes one
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Offline Paul New

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Re: crankshaft options
« Reply #7 on: March 12, 2015, 06:21:02 PM »
Bryant built both of mine with BBC snout. What HP levels are you thinking about running? I have a good used crank that has BB Chrysler snout 3.48 stroke .010/.010 I have the gear drive that goes with it, the crank was built by BRC, the gear drive is Milodon, and the crank hub is RCD.
« Last Edit: March 12, 2015, 07:25:11 PM by Paul New »
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dreracecar

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Re: crankshaft options
« Reply #8 on: March 12, 2015, 06:33:46 PM »
If the price is right- the chrysler snout is a good option
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Ponti

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Re: crankshaft options
« Reply #9 on: March 13, 2015, 03:36:32 AM »
Quote from: Paul New on March 12, 2015, 06:21:02 PM
Bryant built both of mine with BBC snout. What HP levels are you thinking about running? I have a good used crank that has BB Chrysler snout 3.48 stroke .010/.010 I have the gear drive that goes with it, the crank was built by BRC, the gear drive is Milodon, and the crank hub is RCD.
Hi Paul,
 I did drop you a pm about your crank, did you get it?
HP wise. Not sure, I want to build a reliable engine to be competitive with but without having to be tearing it down all the time. A lot of the cars I'm looking at going up against are just mechanical injected SBC's. There are a couple of BBC's in there as well.
 My car's going to be a chromalloy 140ish WB slingshot 350 ci supercharged SBC running methanol, shorty glide. Hopefully a fun car to drive.
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Offline Frontenginedragsters

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Re: crankshaft options
« Reply #10 on: March 13, 2015, 05:13:23 PM »
The last engine we did I called Callies and bought a crankshaft.
They had them on the shelf with a B.B.Chevy snout double key cut.
I called Fred at Donovan Engineering and ordered a gear drive.
All billet cover with crank gear B.B.Chevy size double key ways.
There are more good options on the market. That stuff worked great for us.

Matt
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Offline BK

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Re: crankshaft options
« Reply #11 on: March 13, 2015, 06:10:14 PM »
This might be an option. May take a little clearancing.
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Offline GlennLever

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Re: crankshaft options
« Reply #12 on: March 14, 2015, 09:09:23 AM »
Quote from: BK on March 13, 2015, 06:10:14 PM
This might be an option. May take a little clearancing.

Your a funny man.
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Offline janjon

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Re: crankshaft options
« Reply #13 on: April 06, 2015, 07:29:54 PM »
It would be interesting to see that crank running several thousand RPM. True operating range is probly somewhere in the double digits...
Wartsilla, is it?
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