Bus Conversions dot Com Bulletin Board
December 21, 2014, 09:20:19 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: If you had an Online Subscription: It will not be stolen by your mailman or your neighbor who also may be into buses.
   Home   Help Forum Rules Search Calendar Login Register BCM Home Page Contact BCM  
Pages: [1]   Go Down
  Print  
Author Topic: Hot rodding the 6V92  (Read 1877 times)
lostagain
Hero Member
*****
Offline Offline

Posts: 1622


MC5C




Ignore
« on: January 25, 2013, 12:38:30 PM »

Well, not quite... but improving it anyway.

I have mentioned before that I never thought it made as much power as it should, while making black smoke if a little heavy on the accel. pedal.

I found my turbo (TV8102) was kind of bound up and not free wheeling very well, and only making 10 psi boost, not enough air to feed my 9B90 injectors.

So I traded the turbo for a TV7512 with a A/R of 1.23 at the turbine side, and got 9G90 injectors. That, according to the book, is going to yield 350 HP at 2100 rpm, and 1020 lb/ft of boost at 1200 rpm.

I am doing a tune up today. Injectors timed at 1.46". The book calls for 1.466", but I don't have a 1.466" gauge, so am using the 1.46" that I have. I don't think 6 thou would make a noticeable difference anyway.

Next is installing the new turbo.

I won't get to drive it for another couple of months, but I sure am looking forward to the results. Will report then.

JC
Logged

JC
Invermere, BC
1977 MC5C, 6V92/HT740
Seangie
www.herdofturtles.org
Hero Member
*****
Offline Offline

Posts: 921


And We're Off... Like a Herd of Turtles


WWW

Ignore
« Reply #1 on: January 25, 2013, 01:30:31 PM »

Cannot wait to see how it works out.  Take pics and video if possible...before and afters maybe? 

THANKS!

-Sean
www.herdofturtles.org

Sent from my SPH-L900 using Tapatalk 2
Logged

'Cause you know we,
we live in a van (Eagle 10 Suburban)
Driving through the night
To that old promised land'
bevans6
Hero Member
*****
Offline Offline

Posts: 4881


1980 MCI MC-5C




Ignore
« Reply #2 on: January 25, 2013, 02:39:24 PM »

My 8V71T probably has the same horsepower, and you are going to love it in an MC-5C.  It makes it real nice to drive up hills, I only had to downshift once between Hamilton Ontario and Nova Scotia, and that includes the northern stretch of the Adirondacks in Quebec and New Brunswick...  It was really kind of neat to keep your foot where it was, but hear the engine kind of get a deeper voice and start to growl as it bit into the hill and chewed it up...

Brian
Logged

1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
wg4t50
Hero Member
*****
Offline Offline

Posts: 834





Ignore
« Reply #3 on: January 25, 2013, 03:52:46 PM »

Having used the 9200 injectors, liked them, need a good turbo to burn clean, no smoke.
Dave M
Logged

MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
lostagain
Hero Member
*****
Offline Offline

Posts: 1622


MC5C




Ignore
« Reply #4 on: January 25, 2013, 04:43:12 PM »

We will see if this set up puts out more or less heat than before. With more air, there should be better combustion of fuel. I have a good intake: Ecco filter 1300 cfm IIRC. I can't picture in my mind if that will do more or less heat. The proof will be in the pudding in the summer up a big hill on a hot day.

JC
Logged

JC
Invermere, BC
1977 MC5C, 6V92/HT740
wg4t50
Hero Member
*****
Offline Offline

Posts: 834





Ignore
« Reply #5 on: January 25, 2013, 06:05:55 PM »

If you want to get rid of a lot of heat, remove the muffler and use a resonator, that is exactly what I did on the 8V-92, and liked it. first just used a straight 5" pipe, that was a little harsh, so put the resonator on, that made for a more mello, loess harsh, so I kept it, still on.
Dave M
Logged

MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
lostagain
Hero Member
*****
Offline Offline

Posts: 1622


MC5C




Ignore
« Reply #6 on: January 25, 2013, 06:10:34 PM »

Thanks Dave, I'll keep this in mind. How loud is a resonator compared to a muffler?

JC
Logged

JC
Invermere, BC
1977 MC5C, 6V92/HT740
HB of CJ
Hero Member
*****
Offline Offline

Posts: 1305




Ignore
« Reply #7 on: January 25, 2013, 07:52:02 PM »

I know right now you don't want to hear this again.  But....since you are over $80%$ into the hop up, how about trading in that inadequate turbo for a really "big" turbo and trading those dinky injectors for something more adequate....like say about "140's"?

Then address the intake, exhaust, cooling and most importantly, that necessary BIG air to air intercooler?  Why have 350 hp when you can have a streetable 500?  Just learn to keep your foot out of it unless you want JUST TO HAVE FUN.  IMHO. HB of CJ (old coot) Smiley Smiley Smiley

my humble point is why go to all this trouble unless you are very sure you will happy with the power results forever.  Right now I'm not so sure you will be...in the long run.  Why compromise?  Where is any mention of a JAKE BRAKE?.  Setting racks is FUN!
Logged
expressbus
Full Member
***
Offline Offline

Posts: 162





Ignore
« Reply #8 on: January 26, 2013, 05:23:48 AM »

Best wishes for a satisfactory outcome.
Logged

Will Garner, Jr
Southern Pines, NC
1991 Prevost Conversion by Country Coach
TomC
Hero Member
*****
Online Online

Posts: 6975





Ignore
« Reply #9 on: January 26, 2013, 08:46:51 AM »

Just remember the bigger the injector, the more heat you have to contend with. And the shorter the engine life. Granted the 9G90 is rated for a 500,000mi engine. If you went with 9G00 (100 injectors), you'd have more like 390hp and 1170lb/ft torque. You're theoretical engine life would reduce to 450,000mi. The key with big injectors is to only use it when you really need it.

On my 8V-71T with air to air intercooling, my 7G75 injectors give me 375hp and 1125lb/ft torque. I tried one time going up the Grapevine with almost flooring it, but with the pedal up about an inch with still more to spare (could accelerate above). Instead of the old 32mph was doing 45mph (by GPS). Much more tolerable (30% faster). Good Luck, TomC
Logged

Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
wg4t50
Hero Member
*****
Offline Offline

Posts: 834





Ignore
« Reply #10 on: January 26, 2013, 11:39:29 AM »

Hb of CJ,
we set a 8V-92 to 2650 rpm a with the 150  ( Mil), am a generator
Outfit, was told by the DDC dist, that was the only way we could get the 150 injectors, a long time order,  yes they did good, but had lil less boost psi & some smoke than my 8V-92 with the 120's with a turbo from a 6V-92 (350 HP) that crazy combo pumped up nice biggie psi , required steel air box covers as the stock aluminum just leaked then broke off.
Had lots fun
Dave M
Logged

MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
wg4t50
Hero Member
*****
Offline Offline

Posts: 834





Ignore
« Reply #11 on: January 26, 2013, 03:02:00 PM »

Need to add, the 4501 with the 150's ran slightly better HP wise as my MC7 with the 9200 and the goofy 6V-92 turbo, main difference, my MC7 did not smoke once it started building boost, the 4501 tended to smoke most of the time. just needed more boost.
We both have gotten lil older and maybe lil brighter, those days were when fuel was $1,00 or lil less.
Dave M
« Last Edit: January 26, 2013, 03:06:20 PM by wg4t50 » Logged

MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
sledhead
Sr. Member
****
Offline Offline

Posts: 354





Ignore
« Reply #12 on: January 26, 2013, 03:19:41 PM »

Dave when fuel was a $1. a gal. was the wheels still  made out of wood ?    Just kiddin'  dave
« Last Edit: January 26, 2013, 03:31:08 PM by sledhead » Logged

1990 mci 102c  6v92 ta ht740  kit,living room slide . home base huntsville ontario canada
wg4t50
Hero Member
*****
Offline Offline

Posts: 834





Ignore
« Reply #13 on: January 26, 2013, 05:16:59 PM »

Sledhead,  Actually I think it was about 10 yrs ago for the $1.00 around here, that was when Brunswick Ga was the cheap fuel, now they are the highest, actually cheaper in Fl, hard to imagine..
In those days, my business was going strong and fuel was not expensive, hell for that matter it is still the cheapest art of a bus RV.
But we were having fun with our hot rod bus's. Making fools out of 18 wheelers running empty on the  mountains, always told them I was running a wore out 318  Grin Shocked
some had no sense of humor.
Dave M
« Last Edit: January 26, 2013, 05:20:20 PM by wg4t50 » Logged

MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!