Question for Catserveng
Question for Catserveng
(OP)
http:// www.archit hings.com/ cat-c175-e ngine-refi ned-drive- train-and- efficient- body-desig ns-for-797 f-mining-t ruck/2009/ 10/23/cat- 3524b-high -displacem ent-engine
=============================
I would like some photos of the link for the crankshafts.
A good explanation etc. Does the rear engine have an upgraded crankshaft to take the extra torque?
Thanks ahead of time.
=============================
I would like some photos of the link for the crankshafts.
A good explanation etc. Does the rear engine have an upgraded crankshaft to take the extra torque?
Thanks ahead of time.





RE: Question for Catserveng
And I think Craig Breedlove put four V-8's together to try some land speed record. I understand it was a nightmare.
Call CAT and ask them
RE: Question for Catserveng
http://en.wikipedia.org/wiki/Mickey_Thompson
Craig Breedlove mostly used jet engines.
http://en.wikipedia.org/wiki/Craig_Breedlove
Mike Halloran
Pembroke Pines, FL, USA
RE: Question for Catserveng
I still feel awful for the Thompson family. Of course Mickey Thompson's murder remains controversial, at least according to Lee Goodwin.
RE: Question for Catserveng
As far as I know (I'm not from the dirt side of the business)the front and rear engines are the same. The torque was limited by the electroninc controls to prevent failure, although some did occur early on, and pretty spectacular from what I've been told. The truck pulls a 6% grade with a full bowl at about 22MPH.
The C175 is the current replacement (a 16 cylinder C175 replaced the 3524HD), and is slated to replace the entire 3500 series family eventually in all applications.
I'll see if I can get some pictures or cutaways, I don't work for a dealer anymore and only do limited contract work on the oil and gas and power side, so I don't have all the access I used to.
We also did G3516 tandem units, there are four running on landfill gas here in San Diego for about 11 years.
Mike L.
RE: Question for Catserveng
The Summers brothers "Goldenrod" LSR car was much more successful.
It had four Chrysler Hemis in a row - the car held the wheel-driven LSR record for 27 years.
RE: Question for Catserveng
I worked on another boat that had had a pair of DD V24 (2xV12) engines, which had been removed under warranty and replaced with something simpler because they were troublesome. Nobody mentioned trouble with the inter-crank couplings, but apparently everything _else_ broke pretty regularly. (The newer engines should have received smaller mufflers, but the original monsters were left in place to save a little money. The mufflers shook the entire boat because the engines couldn't always blow the water out of the lift tubes. That was the only boat out of 450+ I worked on that had an exhaust component that was too big.)
I remember seeing such 'doubles', even 2xV6, in Detroit Diesel literature when I was a kid, but in real life, they are not common.
On the few engines I've had occasion to check, the usual 'crank nose' drives the accessory belts and the damper with a press fit and a single key, and couldn't be expected to carry the torque of another entire engine, so torque limiting and/or special 'rear' cranks would be required. Add to that the difficulty of servicing the camshaft or its drive on the 'rear' engine, and you wouldn't buy one either.
Mike Halloran
Pembroke Pines, FL, USA
RE: Question for Catserveng
I like Mike remember the doubles in the detroit literature.
Always wondered what the rear engine crank snout was like. Is it a flange like the flywheel flange?
Where any of these a solid link? Would be similar to a built up crankshaft in large engines.
RE: Question for Catserveng
RE: Question for Catserveng
The crankshafts on a 3500 series engine is flanged at both ends, can be flipped end to end for reverse rotation engines, the engines are rated to be able in most applications to deliver full power from the front with the right front housing adaptor, not common but have been applications like drdge engines with a pump on one end, a generator or gerbox for propusion on the other.
The first couplings were supplied by Vulcan, currently I think they are using APEX (at least on the tandems they are).
My son works on the dirt side as a mechanic, he's going to a class at Tinaja Hills Training Center next month, he'll see if he can get any 3524 info or pictures of the cutaway if it's still there.
Mike L.
RE: Question for Catserveng
So I'm guessing the way the couplings are attached is:
There must be at least 3 items.
A steel spider of sorts that attaches to each of the crankshaft flanges, then the rubber absorber that will be put in one, then engine number 2 is slid into postion and the spider engages the rubber??? I figured it would have to be some sort of isolator to
absorb torsional vibrations and shock.
There isn't much information about marrying 2 or more recip engines. The coupling needs to be somewhat forgiving of missalinement too.
RE: Question for Catserveng
ht
Sorry, I don't know exact model being used.
Our spec for alignment using a laser tool is +/- 0.008" vertical offset and +/- 0.004" horizontal offset, angularity is 1 mil/inch in both axis. The rear engine is clocked 30 degrees behind the front engine, both engines on TDC #1 compression stroke. This info is from our tandem gas engines. On the 3524 there are two close coupled housings, flywheel housing on front engine to front adaptor housing on rear engine. Early on there were tolerence stack up problems that exceeded the couplings ability to compensate for the misalignment, closer attention to the mating faces improved performance and coupling life. Compared to the tandem gas engines the coupling life is short, 8-10k hours on the 3524 compared to 40-50k on the G3516 tandems, of course not nearly the abuse on the gensets the rock trucks see.
Hope that answers the questions, Mike L.
RE: Question for Catserveng
V12, so do they have a 120 degree crankshaft like a 6 cylinder?
I would have thought a 60 degree clocking.
RE: Question for Catserveng
RE: Question for Catserveng