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Carb Drills
http://www.ausmini.com/forums/viewtopic.php?f=2&t=96829
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Author:  Ian_B [ Fri Feb 16, 2018 7:19 pm ]
Post subject:  Carb Drills

Wondered when they would arrive or if they would but they are here today Thanks Kev . Trip tomorrow with Rob to pick up a spare 1100s block.

Author:  drmini in aust [ Fri Feb 16, 2018 8:49 pm ]
Post subject:  Re: Carb Drills

US post to Oz ain't fast. My set of drills took over 3 weeks.
But at least the sizes supplied are right, unlike the POS set of Chinese ones I got on eBay. Sizes missing and others double supplied.

Author:  Ian_B [ Sat Feb 17, 2018 12:08 pm ]
Post subject:  Re: Carb Drills

1100S block Standard bore 300 bucks .Looking out for a spare crank and rods now.
Are those new CAM6232 any good for stroking destroking and wedging ?

Author:  drmini in aust [ Sat Feb 17, 2018 12:23 pm ]
Post subject:  Re: Carb Drills

They have rolled fillet radii on all the journals. Ask GR. ;)

Author:  Ian_B [ Sat Feb 17, 2018 12:36 pm ]
Post subject:  Re: Carb Drills

I think they may be OK in standard form only?? I understand that fillet radius is very important for strength and is where they will fracture if it isnt right

Author:  drmini in aust [ Sat Feb 17, 2018 1:02 pm ]
Post subject:  Re: Carb Drills

You can grind the crankpins down by 1/8" for S rods, at standard stroke, using a standard ground fillet radius. But when/if you offset grind to stroke it the radii will clash. Rolled fillets are smaller diameter than the crankpin is. This will create stress points.

Author:  Ian_B [ Sat Feb 17, 2018 1:21 pm ]
Post subject:  Re: Carb Drills

Wow thats a trap.I guess for a standard stroke road car or a racer on a budget they are a good option.
Might wait for a good 1100s crank to surface .

Author:  kiwiinwgtn [ Fri Feb 23, 2018 6:56 pm ]
Post subject:  Re: Carb Drills

drmini in aust wrote:
You can grind the crankpins down by 1/8" for S rods, at standard stroke, using a standard ground fillet radius. But when/if you offset grind to stroke it the radii will clash. Rolled fillets are smaller diameter than the crankpin is. This will create stress points.


What crank would you use if you are going to off set grind. Also do you need to start off with a standard crank.

Author:  Ian_B [ Fri Feb 23, 2018 7:15 pm ]
Post subject:  Re: Carb Drills

The closer to standard the more stroke can be achieved maintaining standard S big ends.
I presented GR with a standard all over 1100S crank that was in a mates cupboard for many years.
It came back wedged balanced and stroked to 84mm standard S pins standard mains
The fillet radius is great also .Great job from Spero and Graham.

Author:  drmini in aust [ Fri Feb 23, 2018 7:31 pm ]
Post subject:  Re: Carb Drills

I did the same. Except I wedged it myself.
Look for a 12G1505 crank. Preferably STD size or close to. Crack test it before spending any $$$. ;)

Author:  mickmini [ Fri Feb 23, 2018 8:06 pm ]
Post subject:  Re: Carb Drills

Spiro is a legend :-)

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