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-   -   Houstons Engine Service H.E.S. (https://www.rctech.net/forum/offroad-nitro-engine-forum/285444-houstons-engine-service-h-e-s.html)

houston 03-28-2010 07:46 PM


Originally Posted by icemandolmite (Post 7198911)
what up monty
ran your motor in buggy today 11:44 on a tank
tried the 9886 with 21 header that thing is a beast compared to 9901
it pulls everywhere

86 pipe makes lots o power for sure!!!!:nod:

i love that pipe , sometimes even in truggy ;)

Lille-bror 03-29-2010 03:03 AM


Originally Posted by houston (Post 7197722)
i understand the mechanics of a clutch and how to tune the clutch to track conditions lil bror .

the interesting part is the gearing and how final rollout (gear ratio) effects the engine and its power production . the 32 pitch gears we use for 1/8th scale have a pretty broad spread from one gear to the next so it is a little harder to dial in then a 10th scale is . a lot of thought has been put in to the gear ratios on the 8th scale vehicles before they have been released to the public and is usually pretty darn good :nod: some buggys have different ring/pinion gear ratios (associated uses truggy gears) and that lets you use large clutch bells with more gears on them , good concept? seems to work fairly well ;)


we are all fools ;) :rolleyes::lol:

i for one would love to tap into the vast amount of friction materials that are out there and apply them to our rc vehicle clutch shoes :nod: impulse rc;)

two cents worth and just a ramble :p

Hi.

Year, I know you are the expert. I'm not trying to say anything else :)

Here is the gearings you can make on a XRAY buggy:

http://farm5.static.flickr.com/4002/...8c27399a_o.jpg

As you can see, the steps are really small when it comes to bell/center diff ratio.

Cheers

houston 03-29-2010 08:35 AM


Originally Posted by Lille-bror (Post 7200158)
Hi.

Year, I know you are the expert. I'm not trying to say anything else :)

Here is the gearings you can make on a XRAY buggy:

http://farm5.static.flickr.com/4002/...8c27399a_o.jpg

As you can see, the steps are really small when it comes to bell/center diff ratio.

Cheers

I am perpetually learning what I can about the toy cars I like to play with ;)

Ya , you are able to go in small increments if you change spur and clutch bell combos but just changing clutch bell a tooth changes the gear ratio quite a bit and chenges all the characteristics of the engine :nod:

Just changing the clutch bell is what most people do ;)

Lille-bror 03-29-2010 12:24 PM

Cool Monty :D

Another question:

Is the 41005 shorter than a 41021 header?
What about he 41001?
... Or is it just the shape that makes the difference?

I would like to try a header, that is approximate 1 cm shorter than th 41021.

Cheers

houston 03-29-2010 01:02 PM


Originally Posted by Lille-bror (Post 7201993)
Cool Monty :D

Another question:

Is the 41005 shorter than a 41021 header?
What about he 41001?
... Or is it just the shape that makes the difference?

I would like to try a header, that is approximate 1 cm shorter than th 41021.

Cheers

ya the shape of the header makes a pretty big difference in the effect the exhaust has on the engine .

1 cm shorter than the 41021 ? i would say try the ofna/jammin round header , i believe it is a little shorter than the 41021 .

the double bend headers from short to long 41019 , 41001 , 41005

try evrything and educate yourself , this will allow you to see what works best for you ;) remember after you change pipe/header you will have to retune the engine :nod:

rceefreak 03-29-2010 02:16 PM

How's things goin on the left coast with the mill Monty?

houston 03-29-2010 04:57 PM


Originally Posted by rceefreak (Post 7202407)
How's things goin on the left coast with the mill Monty?

i am waiting for the p5xlt tuned to come in and see what it has inside , i will get with ya when those come in and we will discuss which engine you might like ;)

monty

you got my number if you want to talk about it :)

Miniracer23 03-29-2010 07:34 PM

Hey Monty, I got an unusual problem w/ my Toro. A few races ago it went crazy rich in the middle of a race and couldn't figure out why. Had a new TKO front bearing put in and had it pinched while it was apart figured it couldn't hurt. Last week I was letting my dad run it, and during his race it did the same thing. It was so rich and happened so abruptly, I at first thought the throttle linkage was getting hung up and not opening all the way. I ended up leaning the top 2 full turns to get it to get on the pipe. It ran fine for the rest of the race, came off the track at like 210 or so, and still a little fat. Any idea what could have caused it.

icemandolmite 03-29-2010 07:39 PM

IF U RUN HB CHANGE YOUR TANK
IM NOT MONTY BUT I BET THATS THE PROBLEM

Miniracer23 03-29-2010 07:43 PM


Originally Posted by icemandolmite (Post 7203931)
IF U RUN HB CHANGE YOUR TANK
IM NOT MONTY BUT I BET THATS THE PROBLEM

I thought that too. checked the tank for leaks and found none.

allan42r 03-29-2010 07:48 PM

are you guys getting over 10min of run time with the toro ? i know many things = run time.

icemandolmite 03-29-2010 07:52 PM

FILL YOUR TANK AND TURN IT UPSIDE AND SEE IF IT LEAKS FROM THE LID

houston 03-29-2010 07:57 PM


Originally Posted by Miniracer23 (Post 7203896)
Hey Monty, I got an unusual problem w/ my Toro. A few races ago it went crazy rich in the middle of a race and couldn't figure out why. Had a new TKO front bearing put in and had it pinched while it was apart figured it couldn't hurt. Last week I was letting my dad run it, and during his race it did the same thing. It was so rich and happened so abruptly, I at first thought the throttle linkage was getting hung up and not opening all the way. I ended up leaning the top 2 full turns to get it to get on the pipe. It ran fine for the rest of the race, came off the track at like 210 or so, and still a little fat. Any idea what could have caused it.

listen to LA (icemandolmite) he runs hot bodies and has had the same thing happen to him . there is nothing in the engine that could go wrong and cause 2 full turns out of wack tune ;)

houston 03-30-2010 05:06 PM

the tuning bible has been edited with even more knowledgeable tuning tips !! check it out !!

Miniracer23 03-30-2010 05:56 PM


Originally Posted by houston (Post 7204036)
listen to LA (icemandolmite) he runs hot bodies and has had the same thing happen to him . there is nothing in the engine that could go wrong and cause 2 full turns out of wack tune ;)

I wasn't able to find a leak. pressure checked my tank and filled it with fuel to check it. I'm gonn replace it anyway. Just curious though, I would think a leaky fuel tank would cause a lean condition, not rich?


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