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Author Topic: High performance engine parts ID  (Read 7481 times)

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Offline Bill/BentON Racing

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Re: High performance engine parts ID
« Reply #25 on: April 06, 2011, 05:39:47 AM »
.005 was what they recommended back then.RC @ least.,Bill
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Offline paulages

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Re: High performance engine parts ID
« Reply #26 on: April 06, 2011, 12:03:51 PM »
I went with Jay's numbers: .005" under the ring, .003" under the skirt. Block is bored and ready for assembly already, I'm just waiting for gaskets.
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paul
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1976 CB550 (590cc) road racer
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Offline Silverback

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Re: High performance engine parts ID
« Reply #27 on: April 07, 2011, 08:02:19 AM »
Did you just re-use the piston rings?
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Offline bwaller

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Re: High performance engine parts ID
« Reply #28 on: April 07, 2011, 09:21:58 AM »
Quote from: paulages on April 06, 2011, 12:03:51 PM
I went with Jay's numbers: .005" under the ring, .003" under the skirt. Block is bored and ready for assembly already, I'm just waiting for gaskets.

That's exactly what I did with mine too Paul. even with 60mm pistons. Ross claims theirs are -1% silicon and will really grow.
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Offline paulages

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Re: High performance engine parts ID
« Reply #29 on: April 07, 2011, 10:35:52 AM »
Quote from: Silverback on April 07, 2011, 08:02:19 AM
Did you just re-use the piston rings?

I have to re-check the end gap with the new bore, but that is the plan.
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paul
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1974 CB550 (735cc)
1976 CB550 (590cc) road racer
1973 CB750K3
1972 NORTON Commando Combat
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Offline PeWe

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Re: High performance engine parts ID
« Reply #30 on: May 22, 2011, 10:46:04 AM »
Maybe not actual today, might be useful information for others.
I have a set of Russ Collins 836 pistons, purchased 1983.  They are marked inside with:
   RC
  64 H     (64 H is just under the bolt and turned 90 degrees)
  ENG

One of them with a hole due to a meltdown, another one almost hole.  Maybe possible to repair?
They have been used max 7000 km 1984.
« Last Edit: May 22, 2011, 10:50:43 AM by PeWe »
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
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http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline MRieck

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Re: High performance engine parts ID
« Reply #31 on: May 22, 2011, 04:18:53 PM »
Quote from: PeWe on May 22, 2011, 10:46:04 AM
Maybe not actual today, might be useful information for others.
I have a set of Russ Collins 836 pistons, purchased 1983.  They are marked inside with:
   RC
  64 H     (64 H is just under the bolt and turned 90 degrees)
  ENG

One of them with a hole due to a meltdown, another one almost hole. Maybe possible to repair?
They have been used max 7000 km 1984.
no
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