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November 29th, 2004, 04:09 AM   #1
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Husaberg Conrod Crank and Piston Dimentions.

Hi

I am new to this forum and to Husaberg motors, I am an engine builder in the UK and I have just taken on a Husaberg project. I specialise in big bore engines and will be taking the 2003 FE 650 motor that I have out to 750cc. I propose to do this with 105mm piston, 86mm stoke billet crank, new liner and any machining that is required. This may sound extreme but I’ve done single 900’s before so I’m sure its doable.

I need your help! I am busy with other projects at the minute and don’t have the time to strip and measure the Husaberg for a few weeks but I would like to get some of the parts on order with suppliers. I need to know the following for the 2003 650.

Con rod Centre-to-Centre distance?
Big-end pin?
Little-end pin (20mm)?

Piston compression height?

Deck height?

Crank case ID?
Crank max OD?

If you can answer any of these I would be really grateful, it will help me to get a kick start on the project and get my thinking cap on before I get my tools out.

Thanks

Ben Ballard
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November 30th, 2004, 08:58 AM   #2
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Re: Husaberg Conrod Crank and Piston Dimentions.

Originally Posted by JBSracing
Hi

I am new to this forum and to Husaberg motors, I am an engine builder in the UK and I have just taken on a Husaberg project. I specialise in big bore engines and will be taking the 2003 FE 650 motor that I have out to 750cc. I propose to do this with 105mm piston, 86mm stoke billet crank, new liner and any machining that is required. This may sound extreme but I’ve done single 900’s before so I’m sure its doable.

I need your help! I am busy with other projects at the minute and don’t have the time to strip and measure the Husaberg for a few weeks but I would like to get some of the parts on order with suppliers. I need to know the following for the 2003 650.

Con rod Centre-to-Centre distance?
Big-end pin?
Little-end pin (20mm)?

Piston compression height?

Deck height?

Crank case ID?
Crank max OD?

If you can answer any of these I would be really grateful, it will help me to get a kick start on the project and get my thinking cap on before I get my tools out.

Thanks

Ben Ballard
JBSracing
Hi Ben,
Welcome!

Rod ~ 135mm
Big End Pin ~ 32mm
Small End Pin ~ 20mm
Deck Height (No Gasket) ~ 0
Piston Compression Height ~ 13.2mm
Crankcase ID ~ 140mm +/-
Crankcase OD ~ 150mm +/-

Note:
May I suggest the UHE search feature to bring you up to speed http://www.husaberg.org/modules.php?nam ... ile=search regarding potential Husaberg engine areas of concern.

Kind Regards,
Dale

www.D-Lineaweaver.com
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November 30th, 2004, 09:42 AM   #3
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Dale

Thank you very much, this will keep me amused over the holidays.

I have been reading as much of this site as I can get through each night. It is with out a dought the best and most comprehensive site I have ever seen on any engine or bike.

From what I've read I think the counter balancer is out and I'll put bigger mains in if there's room.

I case anyone is interested the engine is going in a sidecar, www.sidecarcross.com gives you some idea. Sidecarcross is much bigger in europe than the states. I will post some pictures of the piston and rod I'm using here soon as I have these already, and will update with pictures of the crank etc as they arrive.

I read a reference to a Belgium 730cc Supermono Husaberg any one know any more about it?

Ben Ballard
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November 30th, 2004, 11:57 AM   #4
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yes,near by there is a team who raced their husaberg 730cc for supermono.(in Belgium monobike)

Power output; Approx 80SAE HP on back wheel.
topspeed 240-250Km/u

They had a lot of problems in the beginning,they put an additional oil cooler on it.Now it goes like an airplane.I tuned for a friend of mine his Honda cr 500 with 76,5SAE HP on the back,and his words were; I can not follow the Berg on the straight fast lines.

In Belgian championship (mclb) rides a husaberg engine also in a sidecar(motocross) std+oil cooler.
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November 30th, 2004, 03:29 PM   #5
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Yeah I have seen a few teams at sidecar races in europe running Husabergs. There were two teams running standard 2004 650's in the GP's this year I took a good look at them.

The problem with 2004's and up is that the inlet manifold is cast on to the head! With the existing chassis/frames for sidecars there is no option of having a top tube air box like the Bergs. We chose a 2003 so we were able to cast a new rubber at a slight angle to get the carb fitted. This has worked out great, we have an almost straight line of sight from a huge air box through the carb' to a custom cast rubber boot of about 1L capacity and on to the inlet we made. Kind of a plenum chamber. Hopefully this will flow better than the fabricated and very small aluminium manifolds on the sidecars I've seen.

Perhaps the solo Husabergs would gain power from a conventional air box and straighter inlet tract?

Do you know any details of the 730 Husaberg? Bore, stroke, what broke when it first ran?
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November 30th, 2004, 03:39 PM   #6
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Dale a question for you?

Is 13.2mm compression heigh from the top of the pin to the top of the piston i.e. pin centre to top of piston 13.2mm + 10mm = 23.2mm?

Didn't really sink in at first, but I tried to draw it on CAD and realised that the piston crown would be rather thin if 13.2mm was from the pin centre?

Thanks
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November 30th, 2004, 03:56 PM   #7
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Hi Ben,

First:
The OEM carburetor inlet is indeed very restrictive. Since our engines are often placed in a purpose built chassis we allow for as much freedom as possible with regard to inlet and exhaust system design.

Second:
The compression height of 13.2mm is piston top to leading pin bore edge.
(ie 23.2mm top to pin centerline)

Please visit my UHE gallery as I believe you shall find several points of interest.

Kind Regards,
Dale
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December 1st, 2004, 02:50 AM   #8
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within the standard frame dale, what size and make of air filter do you recommend please? on the spigot of my keihin that is!

regards

Taffy
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December 1st, 2004, 08:06 AM   #9
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Originally Posted by Taffy
within the standard frame dale, what size and make of air filter do you recommend please? on the spigot of my keihin that is!

regards

Taffy
Hi Taffy,
Barring substantial chassis modification I have yet to find an improvement.

Overall best results were achieved with a K&N RU-0840 (2-7/16" Centered, Tapered 4-1/2"Dx5") air filter fit on a hand formed velocity stack. Unfortunately such requires a custom or modified chassis.

Best Regards,
Dale
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December 1st, 2004, 08:19 AM   #10
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I give the guy a call;

Stroke about 10 mm longer,other cylinder+nicasil,bus,Wossner piston
oil contend;2 liter instead of 1 liter
max rpm about 7600rpm instead 9000rpm.
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