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Ofna picco .26 and ofna jl .28 maxx

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mike_inwood

mike_inwood

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Hey guys I need a help with picking out a big block pipe for these motors. I have ordered a small block to big block pipe adapter from racer 66 but have no idea what header and pipe combo. I was thinking or a Ercm pipe but I want to retain the pipe in the rear position. Thanks for any help. My head hurts from looking at so many pipes and just cannot figure it out and would really like help from so experienced modellers. Once again thanks from Canada.

---------- Post added at 8:03 PM ---------- Previous post was at 8:02 PM ----------

Forgot to mention it's for a traxxas revo
 
the most popular rear mount is the ths bb pipe setup,check the ths site out for details
I have the a .26 reddot in one revo with a 1/8 buggy pipe combo but its a side mount,the revo i'm building at the moment is getting the .28 max which will be running a trx bb manifold and a trinity pipe so I can keep the rear mount setup on the one
ideally i'd love an ercm pipe but financially wise I had to draw a line lol
 
The rear mount ths pipe works great with the 26 mid block motor and pipe adapter. I used that same combo in my revo with a picco 26 max. Side exhaust with a dynamite 053 pipe works great too but personally I don't like the mess that creates.
 
Thanks for the input guys. I ended up ordering the ths 146b. Can't wait to get it now lol. Wife is not overly impressed, lol. But I am
 
mike_inwood;

How did your upgrade turn out w/ the pipe? I recently upgraded my revo to the JL.28 MAX with a Jammin JP-3 side mounted pipe. Seems to perform quite nice on this pipe.

Cheers
 
I still havent got my trinity pipe so I'm forced to use the stock pipe with a bb manifold and it still hauls ass I did however bore out the stinger to as far as it would go
 
The Trinity pipe has been the best BB Revo pipe I have ever used that is still a rear mount. Not a fan of the Revo with a side exit.
 
I have been waiting for like 2 months and its driving me nuts.
the first revo I built which is running the .26 is mated with a dynamite 086 system ,deff an improvement over the stock system but the obvious down side is the mess and the fact it sticks out a bit.the new revo build which doesn't have all the bells and whistles like the first is running the stock muffler with no real adverse affects but once I put a deflector on the stinger makes no mess what so ever and the whole truck just looks much neater plus the .28 is an animal compared to the pesky .26 which I may toss and order the new picco .21 for
 
I run a Picco .28 evo2 in my slayerpro
I have a rear mounted ERCM pipe with a big block stinger on it..
It's hard to keep it from wheeling
Had the trinity pipe on before that,didn't compare
 
THS146b in my opinion this is the best rear exit big block exhaust out there for the revo, does require the adapter kit off ebay. Search "ths big block pipe" in google u will find it.
 
As Ckeith noted the ERCM pipes are about the best pipes you can get for just about any setup. But they are pricey. I have ran the THS an RDLogics and several diff custom setups and I always went back to the Trinity!
 
JL .28 MAX w/ Best Pipe Setup

Hi, Folks;

Here are some photos of my Revo with Mid Block - OFNA JL .28 MAX with a JP 3 Jammin Side Mounted Pipe. I'll offer the following benefits that I perceive from this side mounted pipe setup, from a technical perspective:

a) Weight Distribution: On Revo's specifically, considerable weight already on the back end, the side pipes tend to mitigate weight concentration on the back end and redistribute to the center of the vehicle.
b) Exhaust Flow Pressure Drop (Minor Losses, Darcy Friction Factor): Side pipe exhaust flow is just less 'tortuous' in terms of directional changes, etc.
c) With motor tuned, not much of an issue with unburned fuel on the side of the car.

Of course, I'm running a 34T spur / 20 T clutch bell to tame this setup.

Cheers, Revo_R
 
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Darcy Friction Factor is part of a calculation to determine resistance to flow (pressure drop)...


Cheers,
 
wow now we are getting technical.....
I have both setups on different trucks and ran them both today , honestly it comes down to personal preference I used the side setup with the first build coz it was easier to obtain a side mount exhaust while it is a lot quieter than the other setup it does look a bit dickie but I will keep it that way for the time being.
the second build is using a Chinese trinity clone setup with the .28 and that thing is loud!!
but saying the rear setup is cleaner is not true I had oil everywhere on this one too but it does look better and sounds totally badass.
at the end of the day its a revo and unless you are racing them at a pro level go with whats available to you
 
Yup... agree w/ that generally- if one wants to race, truggy all the way. Revo is just a fun piece of kit.

In terms of my technical feedback... Agree, at the end of the day, decisions come down to preference. However, having a technical basis for those preferences - or more relevant, feedback to others who are asking for opinions is key. I'm sure you'd agree, lots of 'opinion' based feedback out there (e.g., marketing propaganda, internet, etc.) on this stuff, but no technical basis (e.g., superchargers for glow engines).

Cheers,
 
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I'm all for being technical, and I understand the darcy friction factor, but these engines rely partially on backpressure to operate. A good tuned pipe will add restriction regardless of how many bends there are in the manifold. On a Picco, the exhaust port is smaller in diameter than a BB manifold anyway.
I just can't personally justify ruining the look of a revo by hacking up a nice body and installing a side pipe.
 
The SB exhaust port expansion into the BB manifold is fairly irrelevant vs. total manifold/pipe length - as long as one has a nicely machined adapter to fit up the BB manifold to the engine SB exhaust port. The engine exhaust flue just expands over the SB to BB manifold adapter. Yes, these engines require back pressure to aid in pressuring fuel tank, etc. - the idea is to min 'friction' related losses. For my side pipe mounted kit, the body is not hacked up - good sharp hobby knife w/ a steady hand just removes unneeded interference. I've found some folks w/ rear wings (and rear exit exhaust) even need to mod the body due to interference.

Cheers,
 
2revo1maxx said:
I'm all for being technical, and I understand the darcy friction factor, but these engines rely partially on backpressure to operate. A good tuned pipe will add restriction regardless of how many bends there are in the manifold. On a Picco, the exhaust port is smaller in diameter than a BB manifold anyway.
I just can't personally justify ruining the look of a revo by hacking up a nice body and installing a side pipe.
Click to expand...

I agree with 2revo on this I prefer the rear mount pipe on the Revo over a side mount. But I do agree also that the side mounts from my understading of things flow somewhat better.
 
Yup - side pipes flow better (unless there is a new rear exhaust manifold I'm not aware of) & give a bit better weight distribution to some extent, depending on materials. If one is aware of technical tradeoffs, etc. then a decision is a 'good' decision, regardless if one goes w/ rear or side mounted pipe. Just see so much stuff based on opinion out there - no technical rationale (especially in this RC hobby), biggest one that comes to mind is the glow engine super charger - nonsense technically...

Would be nice if we can get all of the Revo drivers together and put all of our different 'theories' to test via "A Drive Off on a ROAR Sanctioned Track"... Now that would be fun - win, lose or draw! Cheers
 

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