851/888 racebike basketcase

Viper1

Fuk dude, how much money you sticking in that thing! Wow! I certainly want to see it in real life! Let me know what RA or BHF day your planing on doing! It would be fun to run with you on this thing!

stafford

nine16 wrote

What heads are you using with these pistons?

stafford

nine16 wroteSPS cams are on the way. High compression Pistals to follow. 996 superbike heads to be ported. More goodies like Ti rocker pins. Hoping for suitable Mg triples, either for the reworked Showas or possible the right set of Ohlins.

Just found this, have you found you have to machine the outer top edge of the Pistals to clear the 996 heads?

nine16

I actually went with CP (Carillo) pistons that Ben Fox had made up. No extra machining necessary.

Mr.R

stafford wroteJust found this, have you found you have to machine the outer top edge of the Pistals to clear the 996 heads?

Hi Stafford,

Are you upgrading/upsizing to a 996cc motor for your race 888?

For my 955cc motor, I got hold of some Corse spec 96mm Pistals and they would've touched the 888 "G" heads at the sides without some form of modification.
I modified the combustion chambers to clear them and to unshroud the 37/32mm valves, also modifying the piston crowns to drop the comp' ratio to 11.8-1*
(it's a road bike so needs to run happily on V Power etc) and to clear the bigger valve heads.
The 37mm inlet valves (up from 34mm) needed to be sunk/cut back slightly into the heads to get a good valve seat and to stop them clashing/hitting the 32mm exhaust valves.
I went for the 32mm exhausts to try and gain some radius on the bottom of the ports, as the old fashioned "G" ports are just a bit too big for the original 30mm items really.

*The Pistals were 12.8-1 in standard 916SP heads, I was aiming for 12-1 but the reshaping of the chambers brought it down just a bit lower than I wanted.

Steve R

stafford

nine16 wroteI actually went with CP (Carillo) pistons that Ben Fox had made up. No extra machining necessary.

Cool, we had to pop a small outer land on mine.

Yes we are up to no good again with a 2nd 888/996 for the Classic TT, news to follow.

Mr.R

stafford wroteCool, we had to pop a small outer land on mine. Yes we are up to no good again with a 2nd 888/996 for the Classic TT, news to follow.

I've already booked my digs (a home stay) and ferry tickets, I'm bringing my 12 year old (almost 13 by then) daughter Lowenna aka "Lolly" over on my '79 900SS...I've still to buy her some ear plugs as the old Bevel is very LOUD!!
She's almost fit to burst with the excitment of the trip. 😎
We're over on Wed 24th until Sat' 3rd stopping in Port Erin, I hope to hook up with you and your crowd at some time. Lolly loves bikes especially Ducati's and would love to meet a real team owner.

Steve R

ducati dad

Hi Steve, PM sent.

nine16

Two more

nine16

Hope to have the motor finished this weekend. In the meantime, mounted the tires and rotors.

nine16

Picked up the motor and forks today. Started the assembly this evening, but can't find the front axle. No axle>>no forks>>no front wheel>>no rear wheel, but still made some progress.

Thought about going with the period Ohlins 9050 forks, but their performance just isn't that good. Suspension technology has advanced a lot in the last 25 years.

So I stuck with the Showa shells, but with a custom 4-piston 25mm cartridge setup from GP Suspension (which should now be available to others who have these forks). Built by Superbike Suspension in Naperville, Illinois.

surfking

Find that axle, those forks with the kit in looking good, along with those tripple clamps.

keep pictures coming, what do you think your run the trees at 27.

nick

nine16

surfking wrotekeep pictures coming, what do you think your run the trees at 27.

Thanks.

Yes, I've started at 27mm offset. Will adjust from there, if necessary.

nine16

Axle arrived and I did a little more after work today.

nine16

Until I can repair and modify the original, I found this New Old Stock aluminum tank. Now to gather all the internals and wire it to the ST4S harness. I plan to use the stock single injector ST4S throttle bodies, but upgrade the injectors to handle the extra.

Couple questions:
What pressure do the original pumps use? Is there a recommended, high-quality aftermarket pump? I'm assuming the connectors won't match the ST4S harness, but it shouldn't be too terrible a job, should it? Is there a block-off cap available for the fuel sender?

BABA

1. Maximum fuel pump pressure on 851 and 888 is 5 bars as all injection model.
The regulator is tared to 3 bars

2. There are some aftermarket pumps. I don't know what is the best.
Here you can find a kit with the special holder, and filters
http://www.euromotoelectrics.com/BOSCH-BMW-K-Fuel-Pump-Kit-PLU-16-12-14-61-576-p/fp-576kitplus.htm

Fortunately, I had found all original parts, but you have to be patient if you want them and they cost money... (if it wasn't for a Racing, I would have taken the easy way above)

3. I made the contrary, adapted the connector of the an SP3 loom to the 888 fuel tank sender, without problem. You just have to find an "AMP Tyco" waterproof automative typ seal (easy).

4. you can use a more recent sender, it's the same thread.

griff851

You can use a standard car fuel pump. Pretty common in Japanese cars. Mazda mx 5, even the Nissan Xtrail. They give 5 bar. Cheap and reliable and lighter. You just have to support it in big hole you have for the above mentioned pump. Usually they have a shrouded male spade connector setup.
Early model fuel regulators are adjustable the later are not. The early ones have blanking cap, that when removed accesses the spring adjuster. If you only have a late model, the check valve that goes in the big threaded hole in your tank, can be pulled apart and the spring changed there by changing your fuel pressure if you wish.

nine16

Looks like the plan will be to have the ST4S injectors modified for higher flow and I will probably run a regulator at 3.5 or 4 bar to keep everything happy and not overly stressed.

New photos.

Titanium therapy.

50mm full Termignoni. High mount tubes are a bit dinged up and CF is a bit burnt, but I can take care of all that next winter. Somehow there isn't a mark on any of the front or rear endcaps. I'll add corse-style rear end cap support tabs as well.

Intake ports look good and are well matched to the manifolds.

nine16

By the way--anyone know which smaller temp guage fits the 53mm hole? The 996 one I planned on using is 58mm.

nine16

Carbon fiber arrived. I'll have to do a little modification to the bottom mounts because of the 888 style rearsets.

I'm figuring out tank internals to run a little higher fuel pressure. The ST4S single injectors are getting sent out for machining for higher flow. But then at least it should all be plug-and-play with the Microtec ECU.

« Previous Page Next Page »