power gain..... et 967

[Nobbyq]

ok ive just fitted a et 967 coming from a jm 781 , and to be honest its not a massive difference , either my jm was a awesome engine or the 967 isnt much better ,or i was expecting too much i still need to tune it , here are my specs which i think might be restricting the engine somewhat , please any advice welcome thanks !!

et 967
bored b pipe
solas 144 mag 14/18 skat
hx3
dual 46mm 2,5 n/s low 125 main 115

 

[DAG]

The 781 is a powerful package. Blue got that thing right. I'm not surprised at all the 781 has more power

 

[Quinc]

Give ET a call on tuning. The 967 should be making significantly more power.

 

[erik mx45]

did you tune your carbs and pipe and prop or just go with same set up you had with your jm motor!?what ski is it in?

 

[E-Tech]

Your B pipe is your limiting factor. Also MSD enhancer does not pull enough timing at top end.
B pipe is maxed at 120 hp if you have a 900 or 1100 does not make a difference.

 

[mike b]

I had a 781 and jumped to a TPE964 and I had a huge power gain. But also my 781 wasn't tuned well and I should have upgraded some of the parts and listened to builders a bit more. My friend has a 781 in his SF and that ski is tuned and I am not surprised why you didn't notice the difference, his is wicked! Another point for Blue on those 781s. Bolt ons are a big key and Bpipe, and 46s are limiting factors. Also pump is small but still can be propped and provide enough power. Can your hull except a larger pump? Might be something to consider later down the road and just depending what your budget is left with. Good luck!

 

[SmittySX]

Tuned to maximum potential the 967 would be noticeably more powerfull. Both great engines. Spend more time tuning before people get the wrong idea. Keep us posted.

 

[Just4Fun]

Try going down a couple prop sizes
14/18 is pretty steep. I'd try 12/18 or 11/17.

Definitely ditch the b pipe and buy a lay down style to unleash the real power that it has the potential to make!!

 

[long beach local]

I would have to take Arts opinion on this . I have an et 967 in a new proforce it delivers stock triple performance but uses the same amount of gas as an sxr800 but its WAY faster . Its Very impressive, the TNT v3 pipe is awesome it completes an awesome package . There is more performance to be had with tuning but it runs so damn good i don`t want to fix something thats not broke.

 

[Nobbyq]

Sorry not wanting to bad mouth any of the two , just looking for advice thanks

 

[Nobbyq]

did you tune your carbs and pipe and prop or just go with same set up you had with your jm motor!?what ski is it in?

Re jetted carbs , put a taller pitch prop in 2011 xfs glass

 

[Waveblaster785]

Try going down a couple prop sizes
14/18 is pretty steep. I'd try 12/18 or 11/17.

Definitely ditch the b pipe and buy a lay down style to unleash the real power that it has the potential to make!!

An engine in the 1000cc range should destroy a 14/18 on a 144. That's not much prop.




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[Just4Fun]

..

 

[Just4Fun]

An engine in the 1000cc range should destroy a 14/18 on a 144. That's not much prop.




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I'm running a 9/16 In a 148 pump on mine. I was reccomended a 10/16 or 11/17 for a 144 pump by my Engine builder.

@Waveblaster785 What prop are you running on your 967??

 

[Superjetjim]

That prop is way too shallow in my opinion. You'll spin it up to the same RPM range as the smaller motor and not feel much difference - you can pull a taller prop now, that's where the power is, like pulling a higher gear in a car..

 

[Waveblaster785]

I'm running a 9/16 In a 148 pump on mine. I was reccomended a 10/16 or 11/17 for a 144 pump by my Engine builder.

@Waveblaster785 What prop are you running on your 967??

I have a TPE1021, but I'm running a 14/21 148. If it were a flatwater ski I could probably go down a pitch or two and be happy slipping more but not ideal for what I do.

Don't know your combo but I ran an 11/17 with my old 785. With my 840 I ran a 13/19 hooker in a 144. Props are subjective, too many variables to equate engine size to prop size but a 14/18 144 seems low for an engine of his size that is running properly.


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[Nobbyq]

That prop is way too shallow in my opinion. You'll spin it up to the same RPM range as the smaller motor and not feel much difference - you can pull a taller prop now, that's where the power is, like pulling a higher gear in a car..

hi jim do u mean my prop ?

 

[Jet_jase]

Yeh that prop is the main issue i'd say. Buddy of mine runs a Dasa 950 with 144 pump and has a 15/21 pitch prop.

 

[Superjetjim]

Yeh that prop is the main issue i'd say. Buddy of mine runs a Dasa 950 with 144 pump and has a 15/21 pitch prop.

What Jase said.

 

[Nobbyq]

ok thanks chaps !