Honda Bearing Shells

davidimurray · Nitrous Nuisance Joined: 04 Jul 2006 Karma :

Hi

Some of the guys at work are looking at rebuilding a dead CBR600 F4i engine that they use in their racecar.

Any ideas where they can get some new shells from?

Cheers

Dave

finpos · World Chat Champion Joined: 13 Sep 2005 Karma :

Honda, for a start.

Best price the whole job before they get stuck in - they will probably find it's cheaper to buy a second-hand engine out of a crashed bike.

finpos.

irving · Traffic Copper Joined: 02 Oct 2006 Karma :

quacker_boy · Cuddle Bitch Joined: 06 Sep 2005 Karma :

Dave as the other two have said, do a full on inspection of the engine first as in completley strip it and find out what needs doing, it may turn into a bit of a money pit depending on how 'dead' the engine is...

Another vote here for buying a second hand working engine and tinkering with it Thumbs Up

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TheShaggyDA · Repost Police Joined: 14 Jun 2004 Karma :

https://www.davidsilverspares.co.uk/ might be able to help you, if not point you somewhere that can.
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Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Chances are a second engine is in fair nick, but the bike surrounding it has been destroyed in a crash.

On a CBR600 you'd have to work hard to knackered anything around the crank. Put that engine into a car and its working a lot harder pushing all that extra weight. Chuck in the extra factor that the kit/race car boys tend to take a bike engine then tune it past reliability, and a new (old) engine looks even more appealing.

Bottom line, bikes tend to crash or wear out their suspenion or suffer major electrical failure long before they wear out the engine.

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

You will have to check the colors at the side of the shells to know what
ones to order.I just hope you didnt mix them up.If you did let me know.

Paddy.

0ddball · World Chat Champion Joined: 15 Jul 2005 Karma :

I'd take the old bearings along to a bearing supplier. If bikes are anything like cars a set of OE mains and big ends from a Honda dealer will cost over £200, good quality pattern ones cost about £40.

davidimurray · Nitrous Nuisance Joined: 04 Jul 2006 Karma :

Hi guys

Thanks for the input. The stories behing these are rather horrid. The engines are used in a formula student car - only weighs 230Kg

They have in total 6 blown engines lying around! First one died because some of the holes in the throttle bodies where filled with liquid metal. This escaped and ended up between a valve and piston - mmm crunchy!

The rest have been due to oil failure - however most have been picked up as a rattle before anything catastrophic went. I know what the problem is and have told the guys working on the car - but they have yet to make suggested mods so they keep blowing engines. I worked on making a new custom sump a couple of years ago. I was very careful when we made up the internal baffling to ensure that none of the 'ports' lined up. The car ran fine for 18 months with that sump, bu they then damaged it and had to make another. Not much care was taken on the baffling, as a result they have killed 5 engines in 4 months!

Unfortunately most of the people involved are students who can do the most amazing computer modelling - but don't know one end of the spanner from another. As a result they haven't even cracked the casing to look inside. They also don't run an oil cooler any more - something I'm not a fan of!

They currently pay around £600 per engine. At the end of the day, it is in their hands - I just hate to see the engine graveyard everytime I walk past their workshop.

Cheers

Dave

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

If they haven't modified the sump system it's no wonder they keep wrecking the cranks. My own bike has a flat sump and swinging pickup but that wouldn't suit a car application because it only swings one side. It sounds like the windage plate you made did a pretty good job, why not make a sandwich-type one that bolts between the cases and the sump and can be transferred between engines?

The best way is to make or buy a dry-sump system. I don't know exactly how the CBR600 setups work but some fit a mechanical oil pump driven off the water pump gear to supply the engine from a reservoir and exchange the stock water pump for an electric item.

I'll try to do some research for you, one of the sidecar boys might even have something to sell.

the grim reaper · World Chat Champion Joined: 29 Jun 2005 Karma :

A mate of mine raced Jedis with CBR6 engines in them and he used a plate between the sum and block to prevent oil starvation. This seemed to work, as the only engine he blew was down to poor fuelling on one cylinder.

One other item to consider is the clutch, a CBR6 weighs about 185 Kg dry, say about 300Kg with a fat bastard rider and a full tank etc. The cars weigh about 300Kg dry, so about 400Kg with a fat driver and fuel etc. There is also the issue that the bike doesn't have as much rolling resistance as the car, hence the clutches take a hammering.

Cheers

Grim
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