JBS 700 Kit on welded 80mm Crank
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- Joined
- Jun 13, 2007
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- 3,871
- Location
- south east WA Australia
:cheers: :cheers: :cheers:
its gonna be a fun machine for sure :twisted:
its gonna be a fun machine for sure :twisted:
It sounds to me like the cylinder and head are dancing the tango, even if minutely.
You need a seal that can keep up with the dance, and of course makeup those static discrepancies.
Some turbo Guys use an inflated Stainless steel O-ring, from Garlock
The Pressure Filled O-Flex™ is designed for Performance Engine applications that require sealing at elevated pressure and temperature in a high cycling environment. The O-Flex™ is filled with an inert gas that increases in pressure proportional to increases in system temperature. This results in an energizing effect that partially offsets the loss of material strength in service.
Garlock Helicoflex O-FLEX™
http://www.helicoflex.com/ViewProduct?p ... 6®ion=1
Application Data Sheet (pdf)
http://www.helicoflex.com/product_techd ... _specs.pdf
.
You need a seal that can keep up with the dance, and of course makeup those static discrepancies.
Some turbo Guys use an inflated Stainless steel O-ring, from Garlock
The Pressure Filled O-Flex™ is designed for Performance Engine applications that require sealing at elevated pressure and temperature in a high cycling environment. The O-Flex™ is filled with an inert gas that increases in pressure proportional to increases in system temperature. This results in an energizing effect that partially offsets the loss of material strength in service.
Garlock Helicoflex O-FLEX™
http://www.helicoflex.com/ViewProduct?p ... 6®ion=1
Application Data Sheet (pdf)
http://www.helicoflex.com/product_techd ... _specs.pdf
.
- Joined
- Jun 13, 2007
- Messages
- 3,871
- Location
- south east WA Australia
if anyone missed the other thread http://husaberg.org/forum/viewtopic.php?f=8&t=13268 I broke a tooth off 4th gear testing a friends TTX fork inserts 
the hybrid head gasket eventually sealed off, when I pulled it out the copper ring with wire ring embedded had compressed to the original copper sheet thickness 1.1mm .. .the wire ring then at this point wasn't really helping IMHO.
reason it took so long was the fibre portion of the gasket to a few re tourques to compress down to 1mm and the wire ring took a few goes to squash into the copper ring
this time machined a groove into the top of the liner and put in a 0.8mm wire ring, (about Phugin time hey Dr_C ? ) re used the 1mm compressed fiber gasket with 1207B and put in a fresh 1.1mm copper ring in the middle, sealed off first go no retourques possible yet. it would probably work aslo as Matts suggested with a shim raised liner on the copper ring I reckon you want about 0.1mm more crush on the copper than the fibre.
with the new Chassis I can really give this thing a proper hammering, lots of time above 7000 rpm, pic of LHS main about 60 hrs but it looked fine at 40 (old chassis)
it feels worse than it looks, rollers have been butting up against the lip, skewing and skidding, digging a groove in the inner race with the roller ends.
I put in an Orangeberg NTN RHS and another 2206 Rollway LHS I expect 20-30 hrs will be enough.
the hybrid head gasket eventually sealed off, when I pulled it out the copper ring with wire ring embedded had compressed to the original copper sheet thickness 1.1mm .. .the wire ring then at this point wasn't really helping IMHO.
reason it took so long was the fibre portion of the gasket to a few re tourques to compress down to 1mm and the wire ring took a few goes to squash into the copper ring
this time machined a groove into the top of the liner and put in a 0.8mm wire ring, (about Phugin time hey Dr_C ?
) re used the 1mm compressed fiber gasket with 1207B and put in a fresh 1.1mm copper ring in the middle, sealed off first go no retourques possible yet. it would probably work aslo as Matts suggested with a shim raised liner on the copper ring I reckon you want about 0.1mm more crush on the copper than the fibre.with the new Chassis I can really give this thing a proper hammering, lots of time above 7000 rpm, pic of LHS main about 60 hrs but it looked fine at 40 (old chassis)
it feels worse than it looks, rollers have been butting up against the lip, skewing and skidding, digging a groove in the inner race with the roller ends.
I put in an Orangeberg NTN RHS and another 2206 Rollway LHS I expect 20-30 hrs will be enough.
- Joined
- Nov 10, 2009
- Messages
- 147
- Location
- FRANCE
in my case, I finished my jbs 710 engine back this weekend,
but I must start all over again because I have water that goes into oil :cuss:
water=1
caf1 silicone sealant=0
I will soon machined the engine cases to put O-rings around the liner
but I must start all over again because I have water that goes into oil :cuss:
water=1
caf1 silicone sealant=0
I will soon machined the engine cases to put O-rings around the liner
- Joined
- Jun 13, 2007
- Messages
- 3,871
- Location
- south east WA Australia
excellent!
but a bit sad too, it is always possible too is is not? that the water is finding its way to the cam chain tunnel at the headgasket?
I know some that have machined small grooves into the liner to take very thin o rings, I will email you a picture.
in my case I guess I am very lucky or the 1207 B is extremely super good stuff i have done 3 builds with it and about 70hrs without water in the oil.
but a bit sad too, it is always possible too is is not? that the water is finding its way to the cam chain tunnel at the headgasket?
I know some that have machined small grooves into the liner to take very thin o rings, I will email you a picture.
in my case I guess I am very lucky or the 1207 B is extremely super good stuff i have done 3 builds with it and about 70hrs without water in the oil.
- Joined
- Nov 20, 2001
- Messages
- 17,043
- Location
- Ely, England
minimum thickness for a left-cover O ring to function is about 2.7mm. 2.5mm is too small. this is with standard coolant pressures and a standard thickness left cover gasket BTW.
regards
Taffy
regards
Taffy
- Joined
- Jun 13, 2007
- Messages
- 3,871
- Location
- south east WA Australia
interesting Crankshaft in the back Contiman
lots of metal removed with grinder and some welded lumps ? I like it :cheers:
lots of metal removed with grinder and some welded lumps ? I like it :cheers:
- Joined
- Jun 13, 2007
- Messages
- 3,871
- Location
- south east WA Australia
Awesome Stuff Contiman :cheers:
looking forward to dyno graphs :twisted:
looking forward to dyno graphs :twisted:
