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Author Topic: 369 AFR 220 heads cam question  (Read 30521 times)
347HO
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« Reply #30 on: August 28, 2014, 10:30:16 pm »

Regardless........ such a difference for a test & tune temporary setup, should not cause valve train mayhem and it will provide you with the verification and confirmation that you are looking for. My   My 2¢

I assume with a .002" increase in lash, cylinder pressure will go up 10psi...  probably more.
Throw pump gas at it and it's gonna be a crap-shoot with timing.
 Hmmmmm
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... it was REALLY revving at like 4K...
If I saw that thing in my rear view Im pulling over to let you by, I be scared of that thing Huh? i dont know wich car is uglier ur or mine?
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« Reply #31 on: August 29, 2014, 12:54:49 pm »

 Thank you for all of the good opinions. I'll let you guys know what I end up doing.
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Antti66ht
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« Reply #32 on: August 29, 2014, 01:21:12 pm »

1mph gain must be small disappointment, nyt maybe not a problem ni anough to tear it to pcs... Now You should just drive it like it was stolen!
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« Reply #33 on: August 29, 2014, 04:24:28 pm »

   Yeah a bit of a disappointment. A lot of money spent for a little return. I'm going to drive it like I stole it at the track. Then I'll pull the motor back out this winter to fix it.
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scienceguy
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« Reply #34 on: August 29, 2014, 04:48:04 pm »

   Yeah a bit of a disappointment. A lot of money spent for a little return. I'm going to drive it like I stole it at the track. Then I'll pull the motor back out this winter to fix it.

Get with it, and put your old cam in it!  Engine should launch better because of the extra cubes, and run harder because of the bigger heads.  Plus, the converter and gearing will already be close.  Should show a significant improvement!
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« Reply #35 on: August 29, 2014, 05:25:53 pm »

Have you done a compression test, do you know what cranking pressure you have??

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btls66coupe
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« Reply #36 on: August 29, 2014, 06:58:17 pm »

 I haven't done a compression test.
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289nate
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« Reply #37 on: August 29, 2014, 10:50:49 pm »

   Yeah a bit of a disappointment. A lot of money spent for a little return. I'm going to drive it like I stole it at the track. Then I'll pull the motor back out this winter to fix it.

Up the shift point to what the cam was designed for and let us know what happens.
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« Reply #38 on: August 30, 2014, 04:50:29 am »

Up the shift point to what the cam was designed for and let us know what happens.

with a 266° exhaust on a 112ECL, the exhaust will probably start to smother at around 7000RPM depending on the lobe used, but yeah you may be on the money Nate, try RPM higher on the shifts see if it makes a diff
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Outlaw Bill
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« Reply #39 on: August 30, 2014, 11:05:06 am »

Adjusting lash can tell you much about your current camshaft, don't be afraid to try it.
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« Reply #40 on: August 30, 2014, 12:35:02 pm »

Adjusting lash can tell you much about your current camshaft, don't be afraid to try it.

TRY it for a run...  Just don't LEAVE it.  If loosening makes it go quicker...  well, you know what you need to do.

Good Luck!
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« Reply #41 on: August 30, 2014, 03:27:56 pm »

Adjusting lash can tell you much about your current camshaft, don't be afraid to try it.

To test that properly, doesn't the car need to be run, as it is, right before changing the lash?
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Don

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« Reply #42 on: August 30, 2014, 03:39:45 pm »

 How much increase in lash should I try? Right now I'm at .018 intake and .019 exhaust.
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Joel5.0
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« Reply #43 on: August 30, 2014, 04:14:09 pm »

0.022" to 0.024"..... BTW...care to say who was your custom cam provider? Knowing a little more about them lobes, would help define the "safe zone" for you. If your lobes are based on a non-TLSR profile, you could easily go all the way up to the old school  "Duntov SFT cam 30-30" area..... not recommended, though.

The 0.022" to 0.024" valve lash would cover SR lobe profiles with a 0.013" to 0.015" lobe lash profile w/out any problems. LUK
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Joel5.0
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« Reply #44 on: August 30, 2014, 04:14:55 pm »

Adjusting lash can tell you much about your current camshaft, don't be afraid to try it.

To test that properly, doesn't the car need to be run, as it is, right before changing the lash?

He already did.... Wink
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ACRONYMS:
LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
Tuning on a Dyno for the track, is like swim practice in a bathtub.
I can explain it for you, but I can't understand it for you. (90lxcoupe)
The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
Nothing sways the stupid more than arguments they can't understand - Cardinal de Retz
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