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Carrelo con rods

Does carrelo balance their con rods (rod to rod and end to end)

Thanks

David
Old 11-24-2017, 05:07 AM
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My new Carrillo's didn't have any balancing grinding marks on them; I don't know how balanced they were from factory (I didn't ask the question of the guy doing my balancing work), it may be that they were within Porsches specification, which is generous versus what can be achieved.

Looking at mine, I wouldn't say that huge amounts were removed from either end, but there's scope for them to be optimised
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Old 11-24-2017, 05:18 AM
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Carrillos

Their new matched sets are usually very close.Fred
Old 11-24-2017, 09:38 AM
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Not that hard to check.
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Old 11-24-2017, 12:13 PM
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Does someone have a con rod balancing fixture I can rent?

Thanks

David
Old 11-26-2017, 06:03 AM
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Quote:
Originally Posted by Harpo View Post
Does someone have a con rod balancing fixture I can rent?

Thanks

David
It'd probably cost you more to ship somebodys rig, than to have your own....I bought one of these:

https://www.amazon.co.uk/gp/product/B01DGLFVS0/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

and one of these:

https://www.amazon.co.uk/gp/product/B01N323E64/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1

Just so I have both bases covered with smaller and larger parts, less than 10 each with free shipping form Amazon. A set of 90 brackets like Trackrash posted (ingenious!) for a couple of quid each from your hardware store, and boom, you have a rudimentary rig.
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Old 11-26-2017, 02:51 PM
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Agreed. I already have a scale so I will see what I can come up with something from work

David
Old 11-26-2017, 03:57 PM
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FWIW, I used a ball bearing in the big end and made sure the rod was level when in the jig. As mentioned I had some large angle brackets that worked out perfectly. The scale is accurate to less than a gram. Some guys will go to 1 /10 g. I don't think that is necessary.
You can do a google search and there are a number of examples of end to end balancing of rods.
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Old 11-26-2017, 05:20 PM
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Juice is definitely worth the squeeze with these rods though. Carrello’s weigh some 150g less each on top of being much lighter. That loss in rotating mass is worth 5-8bhp in a 3L ish engine. Combine that with forged JE pistons which weigh some 150-200g less than stock and you’re really into some nice gains from weight losses.
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Old 11-27-2017, 08:05 AM
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Quote:
Originally Posted by Trackrash View Post
..... Some guys will go to 1 /10 g. I don't think that is necessary.
Yeah the guy who did my balancing work, ex Brian Hart (in fact was best mates with him) and very experienced with top level F1 engines, also holds the opinion that going to 0.1gm levels of balancing is entirely possible but not really required, other than for OCD-reasons. The amount of oil flying around skews the equation massively; I guess that cornering loads or accelerative/deccelerative forces on the chassis, also means that oil-slosh is never going to be consistent across the crankcase.

(...but it didn't stop me getting it spot-bollock-on!)
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Old 11-27-2017, 08:46 AM
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I believe that was part of the reason the Kremer oil bypass mod was taken by the factory in 76, less windage losses in the crankcase.
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Old 11-27-2017, 10:12 AM
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FWIW, after balancing the con rods w/the diy rig, how are you going to balance the crankshaft, the flywheel, crank pulleyj, pistons, etc.? What I'm getting at is engine balancing is performed with specialized machines. Send all reciprocating parts to an engine balancing service, preferably one that understands Porsche, or in lieu of that, you confirm with them the needed tolerances and specifics. Ask questions, but you also need to know the correct answers. Do not assume all balancing services are equivalent.
Old 11-30-2017, 08:33 AM
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Quote:
Originally Posted by 911pcars View Post
FWIW, after balancing the con rods w/the diy rig, how are you going to balance the crankshaft, the flywheel, crank pulleyj, pistons, etc.? What I'm getting at is engine balancing is performed with specialized machines. Send all reciprocating parts to an engine balancing service, preferably one that understands Porsche, or in lieu of that, you confirm with them the needed tolerances and specifics. Ask questions, but you also need to know the correct answers. Do not assume all balancing services are equivalent.
That's why I did indeed send it all out to be balanced by a specialist. Not the crank, as I wasn't tearing the bottom end apart for Build#2. But we know from measuring a stock crank that they come from factory extremely well balanced. I got the SMFW, clutch housing, front pulley and crank position "wheel" I'm using balanced, along with pistons/wrist pins and rods.
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Old 11-30-2017, 02:12 PM
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