Harley Pistons

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Jul 18, 2016 | 09:58 AM

#21

RLH3175

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From: Texas

I found a cut intake seal when I took it apart, so I was real careful putting the intake back on, now there is no decel popping. I rode it 50 miles Saturday, and rode it to work today, there is a big improvement in power, I am very happy with the outcome.

Jul 18, 2016 | 03:48 PM

#22

Owtlaw

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From: Round Rock, TX

Glad it worked out well.

Jul 18, 2016 | 07:36 PM

#23

RLH3175

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From: Texas

Quote:

Originally Posted by Owtlaw

Glad it worked out well.

Yea, thanks for posting about the 10 to 1 Wiseco pistons, I would still be trying to find 9.5 to 1 pistons.

Jul 18, 2016 | 09:07 PM

#24

langwilliams

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From: Lorain Ohio

is 91 octane good for 10 to 1? It's getting harder an harder to find 93

Jul 19, 2016 | 07:16 AM

#25

RLH3175

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From: Texas

Quote:

Originally Posted by langwilliams

is 91 octane good for 10 to 1? It's getting harder an harder to find 93

I burning 91 octane in mine and it is running the best it has ever run since I've owned it.

Jul 19, 2016 | 09:12 AM

#26

RLH3175

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From: Texas

This was the culprit of the decel popping, good thing I have the Power Commander 5 and Power Commander auto tune, it kelp the AFR close enough that it ran good, just popped when you let off the gas.

Jul 19, 2016 | 08:41 PM

#27

Prot

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From: Lafayette, Louisiana

Quote:

Originally Posted by langwilliams

is 91 octane good for 10 to 1? It's getting harder an harder to find 93

It really comes down to your cranking pressure, air / fuel mixture, and ignition timing. It also goes without saying your air fuel ratio is also affected by your elevation. Cranking pressure will be affected by the cam which is why two engines with same compression ratio can have vastly different cranking pressures. Head work and squish zones in a bathtub shaped combustion chamber also come into play.

Other factors for people on the cutting edge are spark plug heat range, spark plug gap, and ambient temperature.

One of these days I need to get around to checking my cranking pressure. I also am curious about putting it on the dyno, even though I am expecting small numbers.