Powderfreak Head

[Rotax_Kid]

While at the SSA show today I had a pretty good conversation with a engine builder. He had a Powder Freak heas for a 850. Made some pretty big claims of mid range gains of 12-15hp and peak gains of about 10hp at 3000' on pump gas with no knock.

Gains seem like a too good to be true. I've never seen a head on a Rotax leave this much on the table. Does anyone have any experience with heads on a 850?

 

[Caper11]

There is alot of talk about porting and a certain pipe giving big gains on the 850, Im waiting to hear the dyno results with this porting and pipe combo.
I would not be surprised if that head give the claimed gains.

 

[Rotax_Kid]

There is alot of talk about porting and a certain pipe giving big gains on the 850, Im waiting to hear the dyno results with this porting and pipe combo.
I would not be surprised if that head give the claimed gains.

$/hp would be a huge bang for buck of true

 

[Ramjet15x]

NPP and Jarrid at Absolute have done dyno runs and have shown 17 hp at 72-7400 and 9 at 76-7800, seems to have dropped peak RPM by about 150 and flattened torque right off on stock set up.
Gained another 5-7 hp with av gas and +2 degrees timing

 

[deaner]

Doesnt surprise me. Isnt the stock compression on these super low?

 

[Dmf]

Doesnt surprise me. Isnt the stock compression on these super low?

130 psi

 

[tex78]

Doesnt surprise me. Isnt the stock compression on these super low?

Ptek and etech are 12.1-1, that's why 13.5-1 makes a big difference and still run pump gas

Would assume the 850 is close to same

130 psi

He means comp ratio

 

[slededjr]

The 850 comp ratio should be at 12.5-1. Unless this head has some state of the art dome design and squish band, I don’t believe it. They have to be making big changes to timing and curve. Time will tell.

 

[mur190]

After seeing various number from NPP's dyno I don't know about that unit... I know the fella thought bought out Split second from Ralph so I may pick up a head and do a stock run on that dyno and put the head on see what gains are there for some comparison numbers.

 

[deaner]

Did many people run high compression heads on the etec with good results? Ive never heard of anyone. I ran an engine tech 14:1 head on my 2010 xp and it was an unbelievable difference.

 

[pfi572]

With mild porting and head I could see those gains but not just the head itself .

 

[slededjr]

With mild porting and head I could see those gains but not just the head itself .

Agreed

 

[tex78]

Did many people run high compression heads on the etec with good results? Ive never heard of anyone. I ran an engine tech 14:1 head on my 2010 xp and it was an unbelievable difference.

I got a h2o head mod done to my 14, definitely has more, especially in the mid

13.5-1

 

[Rotax_Kid]

With mild porting and head I could see those gains but not just the head itself .

Been told by a few people that porting on the 850 isn't as big of a gain as the 800s.

I keep thinking...if the gains for this head are true..why even consider a BB?

 

[pfi572]

Been told by a few people that porting on the 850 isn't as big of a gain as the 800s.

I keep thinking...if the gains for this head are true..why even consider a BB?

Remember when they couldn’t make any gains on the 800 for a period of time as well if this is the case on the 850 ?
Agree 100% with your comment on BB .
Be interesting to see what if any difference there is between previous couple years 850 and the 2019 also?

 

[Caper11]

Been told by a few people that porting on the 850 isn't as big of a gain as the 800s.

I keep thinking...if the gains for this head are true..why even consider a BB?

Not after hearing about the potential gains with porting and a pipe.

But than again wasnt bikeman claiming 5hp with a y pipe???

I was given a tech tip from a engine builder to check and make sure the exhaust gasket was installed properly and not hanging down covering the top of the exhaust port. Maybe thats were bikemans y pipe gain was???? Lol

 

[slededjr]

Everyone I know who has played with these so far all agree that the one y pipe can’t be beat unless you run a pipe too. Just changing the y pipe lost HP and caused detonation.

 

[pfi572]

Everyone I know who has played with these so far all agree that the one y pipe can’t be beat unless you run a pipe too. Just changing the y pipe lost HP and caused detonation.

Even with porting the ones I know want stock Y , pipe and muffler on the 800 etec .

 

[slededjr]

Even with porting the ones I know want stock Y , pipe and muffler on the 800 etec .

My 800 Etec detonated bad with aftmkt y pipe once we ported it. Stock was the best and only one not to detonate.

 

[Powderlites]

https://www.facebook.com/david.forsyth.7547/videos/1818892591496856/?t=21
This with PowderFreaks head testing last spring at Powder Lites