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Dodge - Chrysler Chassis / Re: Rear Brake Size M300 Chassis Question
« Last post by RVSTEVE on Today at 07:35 AM »
Thanks Oz. According to this chart it looks like the only option for the  rear brakes are 13". Advance Auto says for an M300 there are 12" and 13" options for the rear brakes and the wheel cylinders are different also. According to them the M300 Rear 12" brakes have a  wheel cylinder  with a "1.0625 bore and the M300 rear 13" brakes have a wheel cylinder with a 1.25 bore. I looked in the service manual and parts manual but no clear distinction there either. Looks like I will just have to wait to wait till I get the rear wheels off the LTP and see exactly what it is before I order.                  Steve

Advance Auto page:
https://shop.advanceautoparts.com/web/SearchResults?storeId=10151&catalogId=10051&langId=-1&searchTerm=rear%20brake%20well%20cylinders&isFitted=1
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Dodge - Chrysler Chassis / Re: Rear Brake Size M300 Chassis Question
« Last post by RVSTEVE on Today at 07:17 AM »
Tried to measure but to much stuff in the way on the back side to get an accurate reading. Have the front wheels off so don't want to take the back wheels off at the same time but want to order shoes so they arrive when I begin the work.             Steve
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Dodge - Chrysler Chassis / Re: Rear Brake Size M300 Chassis Question
« Last post by Oz on Yesterday at 08:55 PM »
Here's a very handy reference chart:

http://dave78chieftain.com/FrontBrakePads.htm

It includes rear brakes as well.
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Oil is contaminated
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Topics for all Chassis / Re: mpg of new gas motorhomes
« Last post by tmsnyder on Yesterday at 10:07 AM »
In terms of mpg data for modern motorhomes:

Here's some data for 2015 Winnebago Forza motorhomes. These are 34' diesel pushers and they are getting 9-14 mpg:   https://www.fuelly.com/car/winnebago/forza/2015
Diesels generally get 30% better fuel mileage than gasoline, so the same motorhome in gas would be around 7-11 mpg.

Here's a 2014 25' Sprinter based Winnebago VIA, he's only getting 6.1mpg and that's diesel!:  https://www.fuelly.com/car/winnebago/via_25p/2014/newmar/913178
This seems to be an outlier though b/c other 2019 diesel sprinter RV's are getting 14-16mpg:  https://www.fuelly.com/car/winnebago/navion
These small Class C Sprinter vans do seem to get pretty good fuel mileage.  You should get 14-16 but then you're stuck in a small Class C and the buy-in cost is high.

I don't think this is b/c it's a modern motorhome though, I think it's b/c of the smaller frontal area.  I've read that 1970's GMC motorhomes repowered with a 6.5L diesel get 14-15mpg.   And so does a 70s FMC motorhome repowered with a Duramax/allison OD combo.  These are small frontal area motorhomes but they are 26 and 29 feet long.  I don't have any actual mpg data though, just word of mouth.

These 2002-2004 Chevy Gas with OD Workhorse based Class A's are only getting 7-8 mpg based on over 30,000 miles of data:  https://www.fuelly.com/car/workhorse/p30

If you get an older, vintage motorhome and properly maintain it; clean the carb, give the engine a tune-up, make sure the timing is right; you should get similar mpg as a new IF you keep it below 60mpg.

I've read that installing a efi system should get you a little more mpg possibly, but the payback time is going to be extremely long;  not worth the investment.   

So long answer short;  No.  Fuel mileage hasn't improved significantly
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Topics for all Chassis / Re: mpg of new gas motorhomes
« Last post by tmsnyder on Yesterday at 09:36 AM »
Here's two 'old' motorhomes mpg data. 

1976 GMC Motorhome, 26', 455 BB Olds, TH425 (no overdrive):  4,000 miles logged, average mpg:  8.80 after 2% odometer correction
https://www.fuelly.com/car/gmc/tze/1976/tmsnyder/963498

1989 Chevy P30 chassis 1990 Holiday Rambler AlumaLite XL 31' 454 BBC, TH400 (no overdrive):  19,000 miles logged, average mpg: 7.4
https://www.fuelly.com/car/chevrolet/p30/1990/tmsnyder/454843

So you can see mileage is actually trending _downward_ with newer rigs!  LOL

My brother has a 2005 E350 Class C, 25 feet long, V10 with OD and he got about 9 on a recent long trip. 

But as you can tell from the above, I don't trust anyone's mpg claims unless they have a fuelly account and have logged their actual miles and gallons for at least 1000 miles.  If you look at the tank to tank variability, you can see it's easy to get a single apparent high mpg value.  To get actual accurate mpg you need to log every drop, and every mile for 1000s of miles.   You can't get the mpg from a single tank of fuel, not with any confidence.
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Topics for all Chassis / Re: mpg of new gas motorhomes
« Last post by tmsnyder on Yesterday at 09:20 AM »
A friend of ours bought a brand new Damon with a Ford 460 in it.  Its 32 feet long or so.  Fuel injected.  When he got it right off the lot it was only getting 5mpg!  After extensive tuning work including a brand new Banks header system...the whole shebang...he's still only getting 6mpg, and that's on a good day. 

I'm thinking gearing and overdrives and whatnot would have a much more significant impact on gas mileage on a big block gasoline engine...only so efficient a gasoline engine can be, no matter what kind of exhaust you have or how well tuned.  Driving habits probably effect our friend's mileage quite a bit as well, since he tools down the highways at 70mph.

Kev

They quit making the 460 in 1998 btw, I guess it was brand new then?
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Dodge - Chrysler Chassis / Re: Rear Brake Size M300 Chassis Question
« Last post by tmsnyder on Yesterday at 09:14 AM »

Tape measure and find out! :D
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True but if the head gasket blew then the oil is probably contaminated with coolant. 
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No need to drain the oil - this is top end work - not bottom end.
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