Looper exhaust porting

[Will hedrick]

Dickson co ,about 45 min south west of u

[Captain75]

Attachment 423302Attachment 423303

mrichartz:
Mmmm...pics..
What have used to stuff the passage btw the Chambers?
Why no overboard hose from the poppit valve fitting?

Racer:
Thanks for your inputs!
Ring gaps were all set per manual and still looks good.(to me at least)
If I run the 70hp stats as suggested, do I remove all outside hoses including the diverter valve?
Do you have the numbers for these parts (stats, springs, caps)

Perhaps I haven`t allowed it to warm up enough before throttling up?

[mrichartz]

To fill/bridge the gap in the heads I use quick jb-weld (don't need to mold the sides just work quick)
Can use marine Tex or equivalent take some putty to mold the sides if you don't use a quick hardening.
No diverter or blowoff I tap the block on each side
Used the 70hp thermostat covers and springs used same thermostat
Have plenty of pics

Ok not sure why pic of where I tapped the block for water tells it is at the bottom of post but..
ATTACH=CONFIG]423331[/ATTACH]



. Hose on each side


??how long is is running before you hit the gas with a load and take off
How warm is the motor?

I don't think the extreme is as strong or adhere as well as the regular I tried it on some stuff and it didn't hold up..
Think it's good for extreme heat application but not as strong.

mrichartz:
Mmmm...pics..
What have used to stuff the passage btw the Chambers?
Why no overboard hose from the poppit valve fitting?

Racer:
Thanks for your inputs!
Ring gaps were all set per manual and still looks good.(to me at least)
If I run the 70hp stats as suggested, do I remove all outside hoses including the diverter valve?
Do you have the numbers for these parts (stats, springs, caps)

Perhaps I haven`t allowed it to warm up enough before throttling up?

[Captain75]

To fill/bridge the gap in the heads I use quick jb-weld (don't need to mold the sides just work quick)

What method did you use get the jb the same height as the rest of the head mating surface??

Can use marine Tex or equivalent take some putty to mold the sides if you don't use a quick hardening.
No diverter or blowoff I tap the block on each side
Used the 70hp thermostat covers and springs used same thermostat
Have plenty of pics

Ok not sure why pic of where I tapped the block for water tells it is at the bottom of post but..
ATTACH=CONFIG]423331[/ATTACH]



. Hose on each side


??how long is is running before you hit the gas with a load and take off
How warm is the motor?

Probably way too short!! I must confess that a couple of times this summer we just reversed out from the dock and instantly fired away. Stupid as hell, but apparently sometimes you need a Lesson like this
I don't think the extreme is as strong or adhere as well as the regular I tried it on some stuff and it didn't hold up..
Think it's good for extreme heat application but not as strong.

Keep the pics coming!!

[mrichartz]

My idle reliefs don't need filling have all new sleeves and they are put in opposite sides so the relief holes don't line up James Perry did all the machine work and pistons I put it together and did the rest of the work..some random pics
Heres some random pics..




These four are why I went with Boyesen reeds and what happens when motor ate a Reed..
ATTACH=CONFIG]423351[/ATTACH]

[Captain75]

My idle reliefs don't need filling have all new sleeves and they are put in opposite sides so the relief holes don't line up James Perry did all the machine work and pistons I put it together and did the rest of the work..some random pics
Heres some random pics..




These four are why I went with Boyesen reeds and what happens when motor ate a Reed..
ATTACH=CONFIG]423351[/ATTACH]

Great pics!
How much did you shave your 2.7 heads?
Beautiful f/p Windows, Looks great but whats the main reason for extending the windows in this manner? Perhaps I have found an area for further gains...

[mrichartz]

Oh James Perry did all the porting etc you'd have to ask someone else I honestly don't remember everything exactly so don't want to try and answer..
Heads I have to find the measurements they were done before I got them..

[mrichartz]

Think I have a video or two maybe of the old powerheads with the exhaust drilled/filed in the lower unit but think it's only at like 4500rpm...only ones of the new ones are just starting and revving a little at the dock or
If you want I'll find them and post them

[Captain75]

Think I have a video or two maybe of the old powerheads with the exhaust drilled/filed in the lower unit but think it's only at like 4500rpm...only ones of the new ones are just starting and revving a little at the dock or
If you want I'll find them and post them

Do it!!

[racer]

If you have added the control valve to the closed deck that is fine but I would install the newer style thermostats. You said ring gaps ok what were they?

[Captain75]

If you have added the control valve to the closed deck that is fine but I would install the newer style thermostats. You said ring gaps ok what were they?

Tnx racer!
Do you know the number on the t-stats?
I will check my notes and get back on the ring gaps.

[gfinch]

Just remember the ear plugs if you open the lower like that. Plus if you do it like that you can size them for plugs like bilge plugs. In the past I cut oval holes and made plates with thru bolts to plug them up.

[mrichartz]

He is not kidding I do keep ear plugs and headsets for anyone in the back..With no airboxes and vents on the front of the cowls it is loud!.. not family tubing friendly

usually there is never anyone sitting back there and if the hatch is on not sitting back there anyway..

Just being 3-4 ft farther in front seats does make a big difference. I sat back there once holy sh** ...only once

[Captain75]

Drill your own finger ports, you can put them higher and on a better angle than stock

power! I’ve thought about that too!! Thats how they are on most small dirtbikes, and together with a single L-shaped dykes ring you can get them really high! However on my looper application it means that I must open the f/p’s from being behind the liner to a slotted shape, which I think is bad for velocity!??
Please correct me if my reasoning doesn’t add up!

[Captain75]

Tnx racer!
Do you know the number on the t-stats?
I will check my notes and get back on the ring gaps.

Ring gap: 0.7mm ~ 0.027”