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AlbertM
Crackpot



12879 Posts
joined 15 Jan 03

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Posted - 25 Nov 2019 :  18:18:45  Show Profile  Visit AlbertM's Homepage Send AlbertM a Private Message  Reply with Quote Copy this URL to Link to this Reply
It would to. Didn't think of that.

Ford fans be proud. History of Australian motor racing shows Ford has been and will always be superior. They have to slow them down when they get serious about racing. The Phase 4 scared the **** out of people, they banned it. Sierra gets called on a technicality, Falcon EF "...had its wings clipped to make Holden part of the show", AU not allowed to show it's potential, Falcon BF gets clipped. Mustang Is so good Supercars made up a rule and gets a bag of cement in the roof, and it still wins.
_Mford
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djr18fan
Team Manager



New Zealand
1778 Posts
joined 06 Jul 06

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Posted - 25 Nov 2019 :  19:58:36  Show Profile Send djr18fan a Private Message  Reply with Quote Copy this URL to Link to this Reply
quote:
Originally posted by JD

quote:
Originally posted by skaifeman
.... all year they'd be running .006 over everyone else (again, assuming others are to spec.) That's a .86% increase... this is a game of thousands (seemingly literally)....
Yep that's what the engine builder advised on the engines build sheet. They were all set at .706", meaning to get the highest reading of .713" one increased by .007".

It may be possible to get the theoretical exact .700" lift if all your parts were absolutely exactly the same in thousands of an inch but you would need all the planets to be aligned. That's why Supercars have allowed this additional safety net of .010" lift.

Russ's comment that all the people he spoke to advised they were on .700" is total BS and he got conned.

You have to remember we are talking thousands of an inch so all the various parts only have to have a machining tolerance error of a few thousands to make a big difference.

Due to this it can be difficult to obtain a cams exact advertised lift so at the end of the day you may have to work towards accepting a close enough figure.

Not all parts will be exactly the same in production specifically when we are talking in thousands of an inch.

Just about anything we buy nowadays comes with a plus or minus allowance and that would also apply to these parts no matter who makes them. Machine tooling does wear overtime and it also has to be periodically replaced to maintain specified tolerances.

quote:
Originally posted by AlbertM

One assumes it's cast into the heads. But altering that won't change valve lift.

Yes it will Albert and it can be drastically as you then change the rocker to valve tip geometry.



If they were all exactly .706, then all the parts in that engine appear to have been exactly the same. The planets were aligned to .706? If they could all be .706, then maybe it's not so difficult for other engines to all be .700.

Or perhaps the lift on all cylinders was never .706. Despite what was recorded on the spec sheet.

_Mford
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JD
V8 Champion


1080 Posts
joined 09 Mar 05

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Posted - 25 Nov 2019 :  20:55:26  Show Profile  Visit JD's Homepage Send JD a Private Message  Reply with Quote Copy this URL to Link to this Reply
Yes but your not really getting it.

What it showed is DJRTP's engine builder is very fastidious to make the planets align as it may have taken him many many hours to test and retest various sized components until he got each cylinder to .706"

Edited by - JD on 25 Nov 2019 21:01:49
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Kieron302
Team Manager


Australia
6323 Posts
joined 14 May 03

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Posted - 27 Nov 2019 :  12:52:18  Show Profile Send Kieron302 a Private Message  Reply with Quote Copy this URL to Link to this Reply
Just listened to the latest Loud Pedal podcast with Story and he mentioned that SC's are working on a better way to measure valve lift. This to me suggests the issue is exactly as Story said it was, ie different ways of measuring with different dial guages.
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troy01505
Team Manager



Australia
2951 Posts
joined 25 Feb 08

 online

Posted - 28 Nov 2019 :  12:19:09  Show Profile Send troy01505 a Private Message  Reply with Quote Copy this URL to Link to this Reply
quote:
Originally posted by Kieron302

Just listened to the latest Loud Pedal podcast with Story and he mentioned that SC's are working on a better way to measure valve lift. This to me suggests the issue is exactly as Story said it was, ie different ways of measuring with different dial guages.



Good spin on it. Apparently itís to eliminate a grey area, the offseason should see more regs worded in a better way and better procedures to stamp out a lot of areas that can be interpreted or done different ways.
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AlbertM
Crackpot



12879 Posts
joined 15 Jan 03

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Posted - 28 Nov 2019 :  14:52:08  Show Profile  Visit AlbertM's Homepage Send AlbertM a Private Message  Reply with Quote Copy this URL to Link to this Reply
Spin would infer there is a truth out there. Do you you know the truth Troy? Please share if you do.

Ford fans be proud. History of Australian motor racing shows Ford has been and will always be superior. They have to slow them down when they get serious about racing. The Phase 4 scared the **** out of people, they banned it. Sierra gets called on a technicality, Falcon EF "...had its wings clipped to make Holden part of the show", AU not allowed to show it's potential, Falcon BF gets clipped. Mustang Is so good Supercars made up a rule and gets a bag of cement in the roof, and it still wins.
_Mford
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Kieron302
Team Manager


Australia
6323 Posts
joined 14 May 03

 offline

Posted - 28 Nov 2019 :  15:04:00  Show Profile Send Kieron302 a Private Message  Reply with Quote Copy this URL to Link to this Reply
quote:
Originally posted by AlbertM

Spin would infer there is a truth out there. Do you you know the truth Troy? Please share if you do.



Spot on, Unless Troy has inside knowledge (which I seriously doubt) he has nothing, needs to read the findings and listen to exactly what a clearly highly intelligent person who is right in the middle of the situation and is on the SC board has to say.
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