OFNA JL .28 Max 4-Port pipe and header options for maxx

[scootr]

Hey guys

Can someone please chime in and suggest what pipe/header combos will fit the stock chassis and shock towers with this engine on a maxx? Or do ofna expect most to use the resonator?
And is there an ofna roto start for this engine?

Thanks.

 

[hotrodrob]

Your really gonna want a bb pipe for this engine man, a small block pipe is not not gonna do it any justice at all

 

[hulkmaxx]

+1 with hotrod. You can run the traxxas resonator but it will perform much better with a BB setup. If your running the newer style maxx chassis you should have room to shoe horn in the BB pipe and header if not you may have to consider a 4 shock setup.

 

[hotrodrob]

Agreed with the hulk....have you already bought the engine?...theres a handfull of really really good engines out there that are a more direct drop in

 

[scootr]

Have not purchased an engine yet, keen on the JL 28 tho. I have a 4907 and am not sure if the 1/8 scale pipe and headers will fit, as I have read mixed opinions. I have purchased a sb to bb adapter tho from Randy.

---------- Post added at 3:26 AM ---------- Previous post was at 3:16 AM ----------

theres a handfull of really really good engines out there that are a more direct drop in

Have tried the OS 21 and it didnt work out for me. Never held a tune and would always cut out when the temp got over 195 f. Ended up blowing the conrod, probably from running too rich. In hindsight I dont think I got it hot enough during the break in. Maybe I should just rebuild the OS 21 and give it another shot?

I have read the new picco is more of a top end screamer, can be a bit finiky on the tune and has less down low torque than the 3.3.

can't fault the 3.3 tho, idles like a dream and screams at top end. So long as it is kept a little phat on the tune and the bearings are looked after they do go quite well.

Am chasing some thing with a little more down low torque tho.

Here is the rig a little while ago. I think the drive train should be strong enough for nothing too crazy.

https://www.rcnitrotalk.com/forum/showthread.php?t=105093

 

[hulkmaxx]

I recommend the new Picco P1 .21 these engines are screamers! I currently am running one on a revo and one a #4910 maxx. My revo will lift the front end going into second gear! But not enough torque to strip the stock plastic gears in the trans. I have a friend running the Ofna .28 maxx engine with the BB pipe combo on his 3.3 revo, and I can take him all day with the Picco. I am still running a SB configuration on the pipe on my Picco also.

 

[scootr]

Thanks hulk. I have since installed the RR steel transmission anyway. A couple of questions about the picco..
Is the picco finiky on its tune?
Does it have more punch than the 3.3?

 

[hulkmaxx]

Thanks hulk. I have since installed the RR steel transmission anyway. A couple of questions about the picco..
Is the picco finiky on its tune?
Does it have more punch than the 3.3?

Both my Picco's were a bear to break in extremely tight compression. Had to preheat the engine to operating temp, to make starting easier, but I preheat all my new engines before break in. With a good tuned pipe I have never had any tuning issue's with either Picco engine on either rig. And yes the Picco has more torque than the stock traxxas 3.3 mill. I would never go back to the traxxas engines after running the Picco's.

 

[scootr]

Thanks hulk. Might have to try one. Appreciate the feedback boys.

 

[hotrodrob]

Man those os engines normally survive several rebuilds man, maybe you just had an air leak,

 

[hulkmaxx]

+1 on hotrods advice those OS engines are usually a great mill!

 

[Ckeithnitro]

They didn't design the JL .28 very well! it's suppose to be a big block but they put a small block exhaust port on it to run stock pipe...???:\
Go with the new picco all the way, with a ERCM 222sb pipe!You will have a rocket!!

 

[hulkmaxx]

They didn't design the JL .28 very well! it's suppose to be a big block but they put a small block exhaust port on it to run stock pipe...???:\
Go with the new picco all the way, with a ERCM 222sb pipe!You will have a rocket!!

Couldn't agree more with CKEITH on this one!

 

[hotrodrob]

They didn't design the JL .28 very well! it's suppose to be a big block but they put a small block exhaust port on it to run stock pipe...???:\
Go with the new picco all the way, with a ERCM 222sb pipe!You will have a rocket!!

You wouldnt run a bb pipe with it ckeith?

 

[hulkmaxx]

You wouldnt run a bb pipe with it ckeith?

Nope the Picco .21 doesn't require a BB pipe as long as you have a good flowing tuned pipe that's all they need. I run the Trinity pipe on my revo and tried the BB adapter and header it ran better with the SB header and the chamber insert removed! I would think the 222 pipe would flow about perfect for these engines.

 

[scootr]

Is there a roto start backplate option for the new picco ?

 

[hulkmaxx]

Is there a roto start backplate option for the new picco ?

Any starter configuration should fit the Picco that fits the traxxas series engines. Thunder tiger make a nice roto starter, it's called a tiger drive.

 

[Nitro4910]

Have you looked at the HPI savage header, it has just about the tightest bend I've seen on a header.
Any way you slice it a BB pipe n header on a maxx is a tight fit.

http://www.amainhobbies.com/product...roduct-Feeds&gclid=COfMuPKK1LwCFUxp7AodeTcAfw

 

[scootr]

Yep have ordered one. Will update it arrives.