| Author | Message | ||
     Cowboytutt |
Hey guys, I thought you might find these pics interesting. One of Chase McFarland's race bikes developed a valve train problem and the entire engine was dismantled at Ukiah Harley Davidson for warrenty repair. I doubted that I would see the engine in this state again so I took pictures and thought I would share them with you guys. -Tutt         | ||
| Bueller4ever |
Those are some stout looking con rods. | ||
| Nattyx1 |
I wonder how many hours/miles it had on it. I'm kinda troubled by the uneven wear pattern on the cylinder wall... anyone else? | ||
| Cowboytutt |
It had about 800 miles on it but I think it was race miliage. -Tutt | ||
| Datsaxman |
Modern pistons have rather short skirts...so the piston does not rub the wall uniformly. Pretty sure that measuring the cylinder diameter a whole bunch of places is the minimum information you need before you know how the cylinder has worn. | ||
| Cowboytutt |
In the last pic, the brown plastic piece is what snaps out and allows the finger follower to just slide over to the center and let you replace the shim without removing the cams. Clever design. -Tutt | ||
| 1_mike |
Good pictures...thanks. Agree with Bueller4, those rods look much like they'd be well suited for a diesel engine. Interesting that they'd use a light weight piston design and a very heavy rod. The "relatively" short rod is what causes the high load marks in the cylinder walls. Looks like some interesting considerations were made as for the short rod vs. making the engine just a little taller. Which could have been easily been done by moving the muffler...! Again, nice pictures. Mike | ||
| Drhodes1970 |
I was wondering when someone would post some pictures like this. Very interesting. Thanx Tutt. | ||
| Cowboytutt |
Found a better pic of the top end and another of the crank. You'll notice one cam is chain driven while the second cam is driven by a gear off the first. There are slots in the gear that allow for some variation in cam timing too. -Tutt   | ||
| Dano_12s |
Thanks for the pics.In that last photo is the one cam follower broken?-can't tell for sure,but that would be a problem! | ||
| Cowboytutt |
Good eye, Dano! You win the "cupie doll" prize! -Tutt | ||
| Dano_12s |
Sometimes I get lucky Andy!Thanks again-keep'em coming! | ||
| V74 |
for a race bike i am surprised that the crank and conrods have not been polished and the crank shows no sign of being balanced?? pistons should be weighed to make sure the are a matched set as should conrods, all this would add 2 to 3 hp at the crank and a smoother running engine, standard practice with ducati race engines, | ||
| Fast1075 |
That is still a stock production engine, not a "race" as in modified engine..it is in for "warranty repair"....I will bet the pistons are very, very close regarding weight. | ||
| Pyrogen |
Is that factory heat shielding on the frame? | ||
| Slaughter |
Also - you can be DQ'd for almost ANY engine mod to a homologated bike. That INCLUDES polishing. Trying to remember if it was Hayes who was DQ'd on a protest??? If stock homologated engine component isn't polished, then you can't have it polished. I'm pretty certain same holds true for rest of internals. CERTAINLY you can't lighten and balance the cranks. Club racing is different where rules are looser. | ||
| Cowboytutt |
I'm 90% sure the frame insulation is NOT stock. -Tutt | ||
| Pizzaboy |
that frame insulation is indeed stock. i installed the same kit from HD on my 08 that is on the 09 bikes last fall when i did my valve check. and GODDAMMIT i have gone from never having heard of chase 3 weeks ago, to hearing about him all over the place now! he passed me a couple times last weekend at thunderhill in willows as though i had my kickstand down, and my bike was off.... both of us riding in A group!! dude's fast. | ||
| V74 |
it do,s say one of Chase McFarlands race bikes,but i only thought about what class he might run in after i sent my post in, never heard of Chase but wish him all the best, if anyone has pics of a tuned 1125 race engine i would be very interested in seeing them, ducati corse engines come with polished and balanced internals for bsb and wskb,but a tuner for bsb gets 6 pairs of con rods and matches them i pairs by weight,removing material to match them perfectly then the same with pistons and uses the lightest of each to balance the crank,he then polishes everything to a higher standard,these engines are grenades waiting to go off and need rebuilds after every meet,but thats what ducati do to win, | ||
| Cravacor |
The local race shop here told me the class they were racing the 1125s in allowed them to install stronger rod bolts due to engines grenading and spewing oil on the track. | ||
| Americanmadexb |
Want more CMR? http://www.facebook.com/?ref=logo#!/pages/Chase-McFarland-Racing/115143275169338?ref=ts (Message edited by americanmadexb on July 21, 2010) (Message edited by americanmadexb on July 21, 2010) | ||
| Easyrider |
V74 http://www.twinmotorcycles.nl/artikelen.asp?aid=62 this was begin 2008 | ||
| V74 |
what a great site, thanks, |
