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1800cc cruiser in the works for 2020?
- Thread starter chiba
- Start date
ponch1
Ponch
4 valves doesn't need 4 pushrods. Check out a hexhead or oilhead.
jamesevans
New member
Why pushrods? Because a 1800cc twin would explode if it revved fast?
RPGR90s
Member
Market?
I remember the R1200C was supposed to re-write the Cruiser rulebook.
Yeah, not so much.
I remember the R1200C was supposed to re-write the Cruiser rulebook.
Yeah, not so much.
ponch1
Ponch
ponch1
Ponch
The ZL1 and Z-28 camaros rev fairly well. So does the Corvette. Just saying. Which one would be cheaper to own for 10 years...The shiftcam or the 1800? My bet would be the latter. While the high tech stuff is cool and works well, I can see simplicity being attractive too.
ponch1
Ponch
Cool
I saw the Zon at Mama Tried, cool engine, but bike was not for me.
American cruiser riders want displacement!
At the time the R1200C was the largest BMW Boxer, right?
A fundamental of a cruiser is a low seat and feet forward riding position, right where those 900cc cylinders would be.
I'm curious what they are going to make.
a parallel twin with a weird firing order to mimic a V-twin, like the Thruxton, would be a good idea, but their 850 is not going to cut it as a full size cruiser for the American crowd.
My guess it will be a mid control bike, with looks like the Diaval or perhaps the HD FXDR, sorta a drag bike, lots of grunt, stoplight to stoplight.
The FXDX is selling like crap and I do not think the Diaval is much better. The last VMax was a brute, but almost no one bought them.
I for one think they could have a retro bike with the 850 engine. Sort of a "RNineT light", slotted under the price of the Pure. Give it a black tank and white pinstripes.
American cruiser riders want displacement!
At the time the R1200C was the largest BMW Boxer, right?
A fundamental of a cruiser is a low seat and feet forward riding position, right where those 900cc cylinders would be.
I'm curious what they are going to make.
a parallel twin with a weird firing order to mimic a V-twin, like the Thruxton, would be a good idea, but their 850 is not going to cut it as a full size cruiser for the American crowd.
My guess it will be a mid control bike, with looks like the Diaval or perhaps the HD FXDR, sorta a drag bike, lots of grunt, stoplight to stoplight.
The FXDX is selling like crap and I do not think the Diaval is much better. The last VMax was a brute, but almost no one bought them.
I for one think they could have a retro bike with the 850 engine. Sort of a "RNineT light", slotted under the price of the Pure. Give it a black tank and white pinstripes.
ponch1
Ponch
But they do have four pushrods...although stubby compared to the Airheads
No. The intake and exhaust have one pushrod each. The rockers are Y shaped to share one pushrod.
I am on cold medication..so a bit foggy...however
I am fairly certain there are four, each adjuster sits at end of pushrods. when you adjust valves, you are changing clearance between the pushrods and the adjusters.
11 31 7 688 631 VALVE PUSHROD - D=10 0.03 4
The picture only shows one for clarity, but quantity is 4
ponch1
Ponch
Only two. you can see from a picture in our own tech library. Two pushrods per head.
https://forums.bmwmoa.org/attachment.php?attachmentid=17523&stc=1&d=1241117355
wbrownell9
New member
BMW is making their car engines smaller too, at least to the extent that the last 2 digits of the model imply a larger engine than is actually installed. The 530 is not a 3.0 liter engine like you'd think, it's a turbo 2.0 inline four. 540 is a turbo 3.0 inline six, 550 is a turbo 4.4 V-8
ponch1
Ponch
Even a fullsize chevy half ton can be had with a 4cyl turbo.
lkchris
Active member
... or a Porsche
lkchris
Active member
Once upon a time, forced induction (supercharged or turbocharged) was considered equivalent to a displacement increase factor of 1.4. In the 1980s there was a BMW turbo car named to correspond with this ... 745 ... so 3.2.
https://en.wikipedia.org/wiki/BMW_7_Series_(E23)
Pushrod heads are much more compact than similar displacement overhead camshaft configuration.
My guess is that with 900cc on each side, this engine equipped with DOHC heads would be too wide to allow sufficient cornering clearance, unless they mount it so high in the frame that it would negatively impact the center of gravity.
