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 Post subject: Carb Drills
PostPosted: Fri Feb 16, 2018 7:19 pm 
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848cc
848cc

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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.


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 Post subject: Re: Carb Drills
PostPosted: Fri Feb 16, 2018 8:49 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
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.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:


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 Post subject: Re: Carb Drills
PostPosted: Sat Feb 17, 2018 12:08 pm 
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848cc
848cc

Joined: Wed Jul 02, 2014 11:38 am
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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 ?


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 Post subject: Re: Carb Drills
PostPosted: Sat Feb 17, 2018 12:23 pm 
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Location: near Baulkham Hills, NSW
They have rolled fillet radii on all the journals. Ask GR. ;)

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:


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 Post subject: Re: Carb Drills
PostPosted: Sat Feb 17, 2018 12:36 pm 
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848cc
848cc

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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


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 Post subject: Re: Carb Drills
PostPosted: Sat Feb 17, 2018 1:02 pm 
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Location: near Baulkham Hills, NSW
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.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:


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 Post subject: Re: Carb Drills
PostPosted: Sat Feb 17, 2018 1:21 pm 
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848cc
848cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 403
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 .


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 Post subject: Re: Carb Drills
PostPosted: Fri Feb 23, 2018 6:56 pm 
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1098cc
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Joined: Sun Feb 20, 2005 8:11 pm
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Location: Wellington,
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.


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 Post subject: Re: Carb Drills
PostPosted: Fri Feb 23, 2018 7:15 pm 
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848cc
848cc

Joined: Wed Jul 02, 2014 11:38 am
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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.


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 Post subject: Re: Carb Drills
PostPosted: Fri Feb 23, 2018 7:31 pm 
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Location: near Baulkham Hills, NSW
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 $$$. ;)

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:


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 Post subject: Re: Carb Drills
PostPosted: Fri Feb 23, 2018 8:06 pm 
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1275cc
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Location: Sydney - strangely, I am glad of the sight of hills!!
Spiro is a legend :-)

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