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440 + SSW head jetting?

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Hi all,

 

i installed a SSW/RHC +1 head on my "50HP package".

And swapped HC1 to old style HC2 (small difference)

Stayed at fcr39.

Specs see sig.

 

first off the ride report.

Surprised by the gain.

No dyno yet, but it feels kinda like when i went from 400 to bigbore.

That was 5hp gain  (dyno'd).

Low to hi rpm gains, but the hi gains are big. Pulls my arms hard.

 

I expected way less, because even eddie himself says:

the ssw/rhc head is only needed for bigbore/strokers and even then it's only the last piece of the puzzle, worth aprox 2 HP.

 

Well on my bigbore only (dyno'd 48HP before the head) it works miracles!

Does eddie even know his heads work this well on 440's?

 

On to the Q:

What jetting change would be expected?

 

After the new head the jetting seems off.

 

-Idle hangs high after closing throttle.

-Popping at 1/4 steady

seem signs of lean-ness.

But with the airbox-door off it runs better. Airbox off leans it more right?

Pipe smells nothing like gas after riding like rich sometime does.

 

I'm guessing the counter intuitive "same cc, better breathing = smaller jets".

Maybe it needs more then 3x3?

 

Anyone?

 

 

 

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get it on the dyno. Do 2 runs, one with side cover on, and one with side cover off. Then look at the AFR and Torque curves for both runs. That should tell you what direction to go in.

Edited by Positron007

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Use a 155 main jet ....you may  need an OCEMP needle if it's rich with the emn

If it runs better with the airbox door off you are rich...

What were your A/F readings.?

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Use a 155 main jet ....you may  need an OCEMP needle if it's rich with the emn

If it runs better with the airbox door off you are rich...

What were your A/F readings.?

Thanks craig,

 

I will look up my current jetting.

but IIRC i run a 155 main and EMR (one up from EMP, they skipped Q because looks too much like O) already.

I don't know A/F exactly from the last/440cc run, the operator did not save the dyno output to file :(

It was allright overall is all i know.

May have been a bit leanish was my impression while riding it.

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