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-   -   oil pressure for 427 aluminum block (http://www.clubcobra.com/forums/fe-talk/119899-oil-pressure-427-aluminum-block.html)

patrickt 03-30-2013 03:43 PM
Well now, if "posts per year" is any benchmark of savvy....:LOL:

Bernica 03-30-2013 03:45 PM
Thanks Chas. I am out. Good luck Mike.

Bernica 03-30-2013 05:37 PM
Quote:
Originally Posted by patrickt (Post 1237799)
Well now, if "posts per year" is any benchmark of savvy....:LOL:
Really?... Really? Someone has the time to figure out how many post per year? Nice one. I guess nobody has anything else to do or say.. Again, best luck to Mike.

patrickt 03-30-2013 06:20 PM
Quote:
Originally Posted by Bernica (Post 1237810)
Really?... Really? Someone has the time to figure out how many post per year? Nice one. I guess nobody has anything else to do or say.. Again, best luck to Mike.
My point was that Chas is always ragging on me for my 14,000+ posts, most of which is miscellaneous drivel. You really just have to ignore Chas. He irritates everybody, but he does so with no real malice, just crustiness.;)

ERA Chas 03-30-2013 08:02 PM
Quote:
Originally Posted by patrickt (Post 1237819)
My point was that Chas is always ragging on me for my 14,000+ posts, most of which is miscellaneous drivel. You really just have to ignore Chas. He irritates everybody, but he does so with no real malice, just crustiness.;)
Oh in YOUR case it's real malice-AND forethought! :mad:

patrickt 03-30-2013 08:05 PM
Quote:
Originally Posted by ERA Chas (Post 1237830)
Oh in YOUR case it's real malice-AND forethought! :mad:
That's aforethought, with an "a" in front of it.:cool:

Eljaro 03-31-2013 01:55 AM
and in the meanwhile Mike is still trying to figure out where his oil pressure is going:rolleyes:

ERA Chas 03-31-2013 07:03 AM
Quote:
Originally Posted by Eljaro (Post 1237852)
and in the meanwhile Mike is still trying to figure out where his oil pressure is going:rolleyes:
You solved it with the pump discovery, didn't you?? Still low hot pressure??? :confused:

ERA Chas 03-31-2013 07:22 AM
Quote:
Originally Posted by patrickt (Post 1237831)
That's aforethought, with an "a" in front of it.:cool:
Used as a noun, either is acceptable-:rolleyes:

Ron-WHERE is that 'LOATHE' button I begged you for????

patrickt 03-31-2013 07:47 AM
Quote:
Originally Posted by ERA Chas (Post 1237875)
Ron-WHERE is that 'LOATHE' button I begged you for????
Or maybe just a half-button.... Because, you know what they say, half a loathe is better than none.http://www.capitalareacobraclub.com/...ve1/2funny.gif

COACH MIKE 03-31-2013 08:17 PM
FE aluminum block oil pressure
 
I took the cobra out again and warmed to operating temperature. Oil pressure was around 20 lbs at 1100 rpms and responded quickly to rpim increases. 40 to 50 lbs between 2,000 and 2,500 rpm, up to 60 quickly at 3,000+. 60 lbs plus at anything approaching 4 to 4500 rpm. Spoke with Keith Craft and he assures me this is the tendency with the aluminum blocks he builds. If there are any problems he will take care of it. I have every confidence in Keith since I have had two other engines from him and they have performed flawlessly. Also, have two other friends with engines built by Keith and have had no issues with those engines either.
I appreciate everyone's input. Always intersting to see the wide variety of knowledge available on club cobra.
Coach Mike

COACH MIKE 03-31-2013 08:36 PM
FE aluminum block oil pressure
 
Took the cobra out again yesterday and warmed to operating temp. Oil pressure response quickly with any increase in rpm's. 35 to 40 lbs at 2,000 rpm, 45 to 50 quickly at 3,000 + and 60 lbs to 70 at 4500 and up.
Keith Craft explained this was typical for his aluminum block builds. If there are any issues he will take care of it. I have every confidence in Keith. I have had two other engines he built with no problems and very good performance.
Also, two friends he has built engines for with the same good reviews.
Thanks for all the information. Very impressive the wide variety of advice available on club cobra. Much appreciated.
Coach Mike

COACH MIKE 03-31-2013 08:40 PM
FE aluminum block
 
Sorry for the double reply. Thought the first one got kicked off and tried to remember exactly what I posted. Again, Thanks much. Will see how it runs down the road.
Mike

Bernica 03-31-2013 09:35 PM
Congrats Coach Mike. Sending you a PM.

Gaz64 03-31-2013 09:49 PM
Quote:
Originally Posted by patrickt (Post 1237831)
That's aforethought, with an "a" in front of it.:cool:
"That's a forethought" is correct grammar Patrick. ;)
Forethought Synonyms, Forethought Antonyms | Thesaurus.com

601HP 04-01-2013 06:50 AM
Quote:
Originally Posted by patrickt (Post 1237882)
Or maybe just a half-button.... Because, you know what they say, half a loathe is better than none.http://www.capitalareacobraclub.com/...ve1/2funny.gif

That one is a hoot!

You two are whacked!:LOL::3DSMILE::D

David

scottj 04-01-2013 07:04 AM
Since aluminum grows more than iron, to have the same hot idle pressure, an aluminum motor will need to have tighter main bearing clearance when cold. The tighter main clearance can reduce oiling to the rods until proper temperature is reached. It's not uncommon to build aluminum blocks to have a little more clearance on the main bearings. This prevents then end user from kicking the rods out when he stands on a cold motor. As long as pressure comes up on throttle, all is well. Every aluminum race engines I've owned was built this way.

olddog 04-01-2013 05:16 PM
A book I have on the 4.6 ltr modular said the main clearance on the aluminum block is under 0.001" when the temp is below zero. (This is based on my memory of reading the book). The author made a fairly big point that owners need to be very careful keeping the rpm down until the engine warms up.

I'm sure the bearing gap increases with temp on both the mains and the cam. No doubt in my mind that an aluminum engine would see a greater drop off in oil pressure, when warm, than an otherwise identical iron engine.

blykins 04-01-2013 05:23 PM
I set aluminum block main bearing clearances pretty tight on FE's...usually around .0018"-.0020". Taking into account that the clearances open up anywhere from .00075-.001".

Rod bearing clearances are the same as an iron block. Cam bearings get the green loctite treatment.

Lash also grows a lot more with an all-aluminum combo. Iron blocks with aluminum heads get .006" tighter lash when cold as a starting point. All aluminum engines get .010" tighter.

vector1 04-01-2013 07:15 PM
Quote:
Originally Posted by olddog (Post 1238058)
A book I have on the 4.6 ltr modular said the main clearance on the aluminum block is under 0.001" when the temp is below zero. (This is based on my memory of reading the book). The author made a fairly big point that owners need to be very careful keeping the rpm down until the engine warms up.

I'm sure the bearing gap increases with temp on both the mains and the cam. No doubt in my mind that an aluminum engine would see a greater drop off in oil pressure, when warm, than an otherwise identical iron engine.
that same book says the mains grow .002".


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