Author Topic: 9b to 9f  (Read 690 times)

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Offline tc1550

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9b to 9f
« on: February 06, 2018, 10:55:55 AM »
can I sawp my 9b to 9f is .30 that much difference in lift ? WANT A LITTLE MORE UP TOP  117 S&S KIT STAGE 4 HEADWORK DONE BY VENDOR HERE

Offline kd

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Re: 9b to 9f
« Reply #1 on: February 06, 2018, 11:00:36 AM »
Have you spoken with that vendor? They probably will have the best answer to your question.
KD

Online 1FSTRK

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Re: 9b to 9f
« Reply #2 on: February 06, 2018, 11:13:06 AM »
The switch to the 9F will make a noticeable difference if you have the compression and air flow to support it. Make sure you have room for the new TDC valve lift before you proceed 
"Never hang on to a mistake just because you spent time or money making it."

Offline tc1550

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Re: 9b to 9f
« Reply #3 on: February 06, 2018, 11:25:44 AM »
k thanks ill check tdc lift first

Offline johnk1173

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Re: 9b to 9f
« Reply #4 on: February 07, 2018, 02:59:35 PM »
The switch to the 9F will make a noticeable difference if you have the compression and air flow to support it. Make sure you have room for the new TDC valve lift before you proceed

if the TDC lift is within +/- .001 is that OK?

Online 1FSTRK

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Re: 9b to 9f
« Reply #5 on: February 07, 2018, 05:03:40 PM »
The switch to the 9F will make a noticeable difference if you have the compression and air flow to support it. Make sure you have room for the new TDC valve lift before you proceed

if the TDC lift is within +/- .001 is that OK?

Please clarify your question.
Within .001 of what?
Do you mean the cam you are taking out has TDC lifts that are only .001 different from the cam you are putting in?
"Never hang on to a mistake just because you spent time or money making it."

Offline turboprop

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Re: 9b to 9f
« Reply #6 on: February 07, 2018, 06:38:37 PM »
can I sawp my 9b to 9f is .30 that much difference in lift ? WANT A LITTLE MORE UP TOP  117 S&S KIT STAGE 4 HEADWORK DONE BY VENDOR HERE

Where did you get that figure? The Wood 9B cam has .630" lift, while the Wood 9F has .650" lift. The difference being only .020".

IME, the effect of just the difference in lift will be minimal in comparison to the difference the valve timing will make.
'Never try to teach a pig to sing, it only wastes your time and annoys the pig'.

Online 1FSTRK

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Re: 9b to 9f
« Reply #7 on: February 07, 2018, 06:45:34 PM »
can I sawp my 9b to 9f is .30 that much difference in lift ? WANT A LITTLE MORE UP TOP  117 S&S KIT STAGE 4 HEADWORK DONE BY VENDOR HERE

Where did you get that figure? The Wood 9B cam has .630" lift, while the Wood 9F has .650" lift. The difference being only .020".

IME, the effect of just the difference in lift will be minimal in comparison to the difference the valve timing will make.

I am sure he will reply, and the math was a simple mistake.

I took his question as knowing the bigger duration cam is what he wanted but asking if the extra lift was enough that he could/should not be able to just bolt it in. I may have read too much in to his post. I also should have mentioned to check his springs and free travel had room.
"Never hang on to a mistake just because you spent time or money making it."

Offline Barrett

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Re: 9b to 9f
« Reply #8 on: February 08, 2018, 05:12:04 AM »
I think the 4.9 injectors are holding it back more than cams... 5.3's seem to be norm for 117's..

Offline johnk1173

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Re: 9b to 9f
« Reply #9 on: February 09, 2018, 05:32:55 AM »
The switch to the 9F will make a noticeable difference if you have the compression and air flow to support it. Make sure you have room for the new TDC valve lift before you proceed

if the TDC lift is within +/- .001 is that OK?

Please clarify your question.
Within .001 of what?
Do you mean the cam you are taking out has TDC lifts that are only .001 different from the cam you are putting in?

yes, that's what i meant, sorry i wasn't clear in what i was asking. If current cam tdc lift is .210/.190 is a swap to .220/.191 ok or do the heads have to come off and be reworked

Offline kd

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Re: 9b to 9f
« Reply #10 on: February 09, 2018, 06:18:16 AM »
I think you should always at least check your clearances when changing cams that are close to interference tolerances. There are ways to do it without pulling the heads (Nub Tool) but the pistons and valves should be clear of carbon to be sure you are getting a good measurement. You don't really need a Trock Tool but it will be helpful.  There are HTT conversations on the procedure to do this without removing the heads you could read to see if you feel confident or capable doing the "heads on" check. You will need a Nub Tool to remove the valve spring to allow you to measure actual valve travel.
KD

Offline itsafatboy

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Re: 9b to 9f
« Reply #11 on: February 18, 2018, 05:56:10 PM »
i bet it will be fine , but cant guarantee  it , i would run the 9f with a +4 , its a beast , i run the 9bg in mine now with a +2 on a 116"  if its not it will make its own clearance in your piston haha , i have been there done that , cleared itsself after a few minutes