Castle 1717 in the LST - RC-Monster Forums

lincpimp · **Castle 1717 in the LST -** 12.15.2009, 06:05 PM

Ok so after I turned the shaft to 5mm I figured I would give it a try in the LST with the TDR mount. My TDR mount is setup for m3 thread screws with a 25mm spacing, the 1717 uses m4 screws with a 25mm spacing. I have a RCM neu front cover that I modded a while back to accept m4 countersunk screws to bolt onto the motor. It hasm3 threads spaced 25mm apart so I used some short m3 countersunk screws to mount it to the TDR plate, after I mounted the 1717.

I need to get another TDR mount, so I will have "the dude" drill and countersink the front plate for m4 size screws. Turns out my new 1521 1y also has m4 threads, so maybe I will have him make me 2 of those plates...

Anyways, here are some pics. The spur is a 59t, and the 25t pinion will not mesh quite close enough. This is not due to lack of adjustment in the mount, the 1717 contact with the tranny "foot". I can cut the "foot" down about 1/8" and re-drill the hole in it and in the chassis to gain the necessary clearance. However a 63t (stock lst 2nd gear) spur should work fine without any mods to the tranny.

Pic time!

lincpimp · 12.15.2009, 06:20 PM

Here is the speed calc result. 42mph is not too bad, wish I had some larger pinions... Guess i could mod the tranny and use the 59t spur. That would get me around 45mph. Or use the xxl tranny internals...

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.9130434782608696
Spur Tooth Count: 63
Pinion Tooth Count: 25
Total Voltage: 22.2
Motor KV: 1577
Tire Diameter (inches): 6.5
Tire Ballooning (inches): 0
Spur/Pinion Ratio: 2.52 : 1
Total Ratio: 15.94595 : 1
Tire Circumference (inches): 20.42 inches (518.68 mm)
Rollout: 1.28:1
Total Motor Speed: 35009.4 RPM
Vehicle Speed: 42.46 mph (68.2 km/h)

redshift · 12.15.2009, 06:25 PM

You sure that's gonna be enough motor?

Haha if your spur ever locked up I think that motor would just spit the whole trans off!

Looks trick, I REALLY think Castle should offer a step shaft.

I'll be praying for your entire driveline....

Bondonutz · 12.15.2009, 06:36 PM

OMFG, That 1717 dwarfs the tranny !
Anxious to hear feedback after you drive it, should be SICK.

lincpimp · 12.15.2009, 08:36 PM

It is a big motor. Fits well on the tdr mount. I have a feeling geared for low 40s it will be a best. Most likely will end up in the 6x6 lst, as that truck will be heavy and geared lower. The 1521 1y is plenty for a lst, but I could not resist giving the 1717 a try in a lighter vehicle.

Semi Pro · 12.15.2009, 11:26 PM

looks great, im just waiting on some parts from TDR befor i get to mount mine

lincpimp · 12.15.2009, 11:45 PM

They have 20% off right now, I just picked up another mount and a spare m4 sized center piece.

J57ltr · 12.15.2009, 11:59 PM

I like that motor it looks like a Fosters can.

Jeff

Desert Rc · 12.16.2009, 12:48 AM

Thats badass!!! the can is almost the same width as the chassis....PERFECT!!!!!

lincpimp · 12.16.2009, 12:56 AM

Quote:

Originally Posted by J57ltr

I like that motor it looks like a Fosters can.

Jeff

Funny, that was my beer of choice back in the day!

J57ltr · 12.16.2009, 01:04 AM

I have been looking at the Castle lineup and thought they ought to give them beer names like Tallboy, Little Kings, Fosters, and the 8 oz.

Jeff

lincpimp · 12.16.2009, 01:07 AM

I would like to see a "Old English" myself. Or maybe something potent named "Mad Dog 20/20"!!!

Night Train would be good too!

J57ltr · 12.16.2009, 01:16 AM

Well if you are going to get into wine how bout Thunderbird.

Jeff

12.16.2009, 03:10 AM

i think you could gear this thing for 60 with that motor, running it on 6s james? this thing is going to be ganster! ha

Semi Pro · 12.16.2009, 07:34 AM

Quote:

Originally Posted by lincpimp

They have 20% off right now, I just picked up another mount and a spare m4 sized center piece.

yep i grabbed a single speed adapter and a m4 center too, sucks that he is out of the 6mm cullets