08-22-2021, 07:52 PM | #1 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
400jr cam
Need a favor,have a cam from an ld stockcar engine that's supsed to be a 400 jr. info on cam has been ground off. Base circle is .954 grose lift .408. Thanks
Gramps |
08-22-2021, 08:29 PM | #2 |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
|
Re: 400jr cam
This any help?
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES |
Sponsored Links (Register now to hide all advertisements) |
|
08-22-2021, 09:30 PM | #3 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: 400jr cam
Yes, I have all that, however, it doesn't represent the measurements of the cam. Thanks for the response tho Ron
|
08-23-2021, 03:16 AM | #4 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: 400jr cam
Have to take my wife to surgery, so can't do anything at the moment. But, if you don't get the info you are looking for I have a 400jr I can measure.
|
08-23-2021, 08:59 AM | #5 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: 400jr cam
Thanks Jserry, I appreciate that. Hope the wife is OK, Hard to live without them.
Ron |
08-23-2021, 10:00 AM | #6 |
Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,064
|
Re: 400jr cam
Sponsored Links (Register now to hide all advertisements)
|
08-23-2021, 03:50 PM | #7 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: 400jr cam
B&S, yes, I agree. However, I just asked for the size of the base circle and the grose lift. To compare it with my cam. I'm quite sure it is a 400jr as I used several during my builds and these numbers look familiar I didn't think it would get this complicated. On another note: have you ever thought that the torque output of na engine followed the airflow of the intake, and big displacement flatheads loose their torque at a lower RPM??
|
08-23-2021, 06:55 PM | #8 |
Member Emeritus
Join Date: May 2010
Location: Fitzgerald, Georgia
Posts: 2,204
|
Re: 400jr cam
Ron, the base circle dimension can be somewhat different on cams with exactly the same characteristics based on what the original cam core condition was. A regrind might have a significantly smaller circle than one from a new core.
And, yes, a big cube engine with have torque reduction at lower speeds than a small engine. HOWEVER, it will also begin torque production at a higher value than the small engine and even with the accelerated torque reduction probably will out perform. |
08-23-2021, 09:21 PM | #9 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,408
|
Re: 400jr cam
Quote:
If you vary the cam base circle from that too far, you can be in for early failure. Way back, a lot of new cam grinder people came on the scene and they thought they would save a few minutes and "cut a fat hog" by just cleaning a lobe on a regrind instead of grinding it to the original size. If there was a large difference, the lifters usually failed first. |
|
08-24-2021, 06:13 AM | #10 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: 400jr cam
John, I was aware of that, I just thought that if I got some numbers, I could compare them to mine. The reason I want to use the $00 jr, is because the cam is available to everyone. If the new designed port works well, I want everyone to be able to reproduce it. A much better cam would be the Erson D410, but it's no longer available . Also remember this is a small engine (258) Too bad I'm not rich I could just buy one.
Gramps |
08-24-2021, 03:04 PM | #11 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: 400jr cam
I can get the info today Ron.
|
08-24-2021, 04:39 PM | #12 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: 400jr cam
I think we'll all be waiting.
G |
08-24-2021, 04:56 PM | #13 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: 400jr cam
I'm getting very similar numbers to yours. Base circle around .951 and heel to toe on cam 1.358, so .407.
|
08-24-2021, 05:36 PM | #14 |
Senior Member
Join Date: May 2010
Location: Charlotte NC KiWi-L100 available here
Posts: 2,960
|
Re: 400jr cam
Ron I have a 400jr in box from Isky. .407 lift. .930 base circle. New in box with card.
Keep in mind if the L100 suits your port design it is readily available. Cheers Tony Last edited by KiWinUS; 08-25-2021 at 06:06 AM. |
08-24-2021, 05:38 PM | #15 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: 400jr cam
Thank you very much, Now I can convert this cam to an 8BA style. I bore the nose for a 3/4 press in bushing , then turn iy down for the timing gear. I know they make adapters but the gesr doedn;t run very trur and you don't get the oiling,and this is cheaper. Thanks again Ron.
|
08-24-2021, 05:42 PM | #16 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: 400jr cam
That's interesting, my cam is new, in box, from Isky as well. Seems odd they would grind the same cam with different base circles.
Last edited by JSeery; 08-24-2021 at 06:15 PM. |
08-24-2021, 10:41 PM | #17 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: 400jr cam
Caams can be ground from used cams as well as billet's. The buillits will have a larger base circle.
|
08-25-2021, 04:33 PM | #18 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
|
Re: 400jr cam
Didn't know Isky sold re-grinds, but I lot I don't know about Isky!
|
08-25-2021, 05:17 PM | #19 | |
Senior Member
Join Date: Dec 2010
Location: East Coast in CT
Posts: 1,529
|
Re: 400jr cam
Quote:
Isky in the past {the last Century} sold cams that were ground on used cores I recall one engine build I was involved with. The owner purchased a new cam directly from Isky I think it was 400 jr. Helping this fellow install the cam I noticed it was extremely loose in the cam bearings. The original stock cam fit the cam bearings perfectly so we discovered this cam from Isky had .010 undersize bearing journals! Used cam reground including undersize bearing journals with no notation what's so ever from Isky with the paper work included sure had a couple of guys pissed off that day. Ronnieroadster
__________________
I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
|
08-25-2021, 06:31 PM | #20 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,312
|
Re: 400jr cam
Lots of bad things happening at Isky during the '90's. There were times when, unless you degreed the cam, there was no assurance it was ground right. Hopefully they have got it straightened out.
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|