Tuned motor

Update

I have sourced some heads from Motorworks, they were a little scabby in terms of the powder coat flaking and I want the satin black finish for the whole motor in any event.

So they have been chemically stripped and are now masked for blasting and then painting with PJ1. They will then be sent to S.E.D for the large valves to be fitted.

I'll post some more images once I have painted the heads.
 
wish I'd seen this earlier I have a pair of complete R1100S heads 2 barrels and matching pistons off a motor that did the RH big end everything else is absolutely fine except the RH big end and it still ran once I'd refitted the timing pulley that had hammered loose with vibration? Mind you it was a tad knockey but still revved up etc

I wasn't looking for a stuffed big end when I found the loose timing pulley I just thought I'd found the explanation for the sudden engine stop
 
Confused

How can fitting larger inlet valves to existing valve seats improve gs flow?, surely they will just mask the port, opening up the seat size would make sense but I can't see how partially masking the inlet valve seat will improve
gas flow.
dave gs.
 
davegs said:
How can fitting larger inlet valves to existing valve seats improve gs flow?, surely they will just mask the port, opening up the seat size would make sense but I can't see how partially masking the inlet valve seat will improve
gas flow.
dave gs.
Click to expand...


I will be replacing the valve seats as well. I am going from the advice of bbpower and S.E.D as well as folks on this site, so it should work.
 
You don't need to replace the inlet valve seats, they will accept the 36mm inlet valves perfectly, SJBMW in America do this conversion using the standard seats.
Anyone advising that you change the seats is just trying to charge you for unnecessary work.
 
MotoGS1100 said:
You don't need to replace the inlet valve seats, they will accept the 36mm inlet valves perfectly, SJBMW in America do this conversion using the standard seats.
Anyone advising that you change the seats is just trying to charge you for unnecessary work.
Click to expand...

Would this not reduce the seat/valve contact width, great for racing but not too good for the street...Just asking... :nenau
 
The seat/valve contact area isn't a problem, the standard valve seats are on the large size meaning the width of the contact 'ring' can be maintained.
The inlet valves obviously run cooler than the exhaust valves as they are subjected to the cooling effect of the inlet charge hence why they can run narrower contact areas.
Just for information, the first R850 motors with their 32mm inlet valves used the same valve seats as the early R1100GS with their 36mm inlet valves.
 
MotoGS1100 said:
The seat/valve contact area isn't a problem, the standard valve seats are on the large size meaning the width of the contact 'ring' can be maintained.
The inlet valves obviously run cooler than the exhaust valves as they are subjected to the cooling effect of the inlet charge hence why they can run narrower contact areas.
Just for information, the first R850 motors with their 32mm inlet valves used the same valve seats as the early R1100GS with their 36mm inlet valves.
Click to expand...

:beerjug: :thumb
 
GS01 said:
I have sourced some heads from Motorworks, they were a little scabby in terms of the powder coat flaking and I want the satin black finish for the whole motor in any event.

So they have been chemically stripped and are now masked for blasting and then painting with PJ1. They will then be sent to S.E.D for the large valves to be fitted.

I'll post some more images once I have painted the heads.
Click to expand...



Nice mate, I've a thread on here too. I'm rammng a r1100s engine in an 1150gs. Full laser race system, boxerboost cams etc and custom induction setup planned.

Latter I'll stick the 1150heads etc on it and run thhigher comp pistons!!

And I get to play about with the different gearboxs/ratios and final drives untill I'm happy! Bonza!!
 
Bigger Valves

Very interesting thread

I have a pair of heads from a 1200GS and want to fit inlet & exhaust valves from these to a 1150GS

Does anyone know whether the valve seats can take these larger valves without being replaced. I think I have read that inlets are OK but what about the exhaust?

Was also planning on skimming head by 10 thou or so to raise compression. My aim is to keep basic charateristics of 1150 engine but with a bit more power. Don't want to end up with a jap style race engine.

Any advice appreciated.
 
Thanks for the advice

Seems like a low failure rate considering the number of 1200's out there. If fuelling is causing this issue (seems like a reasonable explanantion) then this will not be the case in an 1150.

I think the basic design of the valves is sound as they are the same for RHS and LHS cylinders and only RHS failures reported.

Anyone else got anything else to add?
 
magno said:
I think the basic design of the valves is sound as they are the same for RHS and LHS cylinders and only RHS failures reported
Click to expand...
Nope there are left side failure occuring too

I've just had one friends bike drop a valve last week If I hadn't been riding the fecker I wouldn't have believed that It was going easy (leaves and tractor muck locally) when it dropped off

http://www.ukgser.com/forums/showthread.php?t=207622
 
Failure

Like many things in life this project promised much but has delivered very little.

I sold the GS last autumn and the parts are now for sale.

I got sick of messing about with bikes and searching the net for answers and suppliers etc...

I have bought a Honda, fill it with petrol, ride it, wash it. Bland but it works.
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
You must log in or register to reply here.

Similar threads

Boxerboy55
Now I can't remove the starter motor . . .
Replies
17
Views
764
RS-eyJohn
RS-eyJohn
Duff battery or duff starter motor….?
Replies
8
Views
659
Bikermike1411
gabriel_gs
Fancy exhibiting your bike at the Woking Motor show?
Replies
9
Views
535
NeverRodeBefore
NeverRodeBefore
Motor tablet pro max
Replies
5
Views
908
RSDaz
The motor is running on only the secondary spark plug 1150GS ADV
Replies
13
Views
1,193
Ian J Hartley
Ian J Hartley


Back
Top Bottom