4 Cam engine tool pictures

Discussion of 4-Cam Type 547 engines (and all the Fuhrmann racing variants) and cars that powered them.
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Jacques Lefriant
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Re: 4 Cam engine tool pictures

#31 Post by Jacques Lefriant » Mon Mar 29, 2021 10:14 pm

Hi Martin
i showed the fixture at the start and the finish of the arc. you have to actuate the handle go from start to finish. I repurposed a dresser for grinding wheels that normally holds a diamond to put an arc on a wheel and that would be a production method of doing a bunch of them in a line. Web Cams when they do 911 rockers uses that method. The Petr Pohl book shows a similar fixture but mine i believe to be more robust. The other fixture is used to reduce the stem diameter to accomidate the lash cap which has a 8.8mm ID instead of 9mm if you use 11/32" valves you have loose lash caps. That tool is originally used to grind the od of pins without having to use a centerless grinder i had to extend the handle to clear the head of the valve. if your valve grinder could hold the valve the oposite way you could do the same thing.
j
 

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Martin Benade
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Re: 4 Cam engine tool pictures

#32 Post by Martin Benade » Mon Mar 29, 2021 10:38 pm

I guess I am slow. It looks like the tool gives a radius of maybe 20 mm. Is that correct? The follower appears to have a much larger radius than that. Or are my estimates way off?
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Jacques Lefriant
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Re: 4 Cam engine tool pictures

#33 Post by Jacques Lefriant » Tue Mar 30, 2021 11:09 am

Hi Martin/Harlan
if Harlan looks at the print he would find it is 40mm.
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Harlan Halsey
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Re: 4 Cam engine tool pictures

#34 Post by Harlan Halsey » Wed Mar 31, 2021 4:37 am

Jacques Lefriant wrote:
Tue Mar 30, 2021 11:09 am

if Harlan looks at the print he would find it is 40mm.
j
Jacques, I stand corrected. I checked the drawing in the Carrera book and you are right, 40mm!
I was under the impression that the radius was much larger. The number is not on the drawing in the Carrera Guide, but it is on the drawing in the big Carrera book, with the admonition that the cam surface be parallel to the lash cap surface. Your jig on the surface grinder should make that job a breeze.

Is there a current method of re-surfacing the levers? Hard chrome maybe? (I think this is a textbook case for ZDDP.)

What is the current situation with lash caps? It used to be that the 9mm ones were rare and I used to trade them with Bill Doyle to get what I needed. Then I made a couple out of Stress Proof and ran them in one race, but I haven't checked to see how they did, except that the engine still runs fine.

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Jacques Lefriant
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Re: 4 Cam engine tool pictures

#35 Post by Jacques Lefriant » Wed Mar 31, 2021 10:33 am

Hi Harlan
I really miss Billy he would answer my naïve questions and when i thanked him he would reply "my pleasure" i am hoping that with the current leadership that overtures can be made to the SoCal club to reprint his articles.
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Jacques Lefriant
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Re: 4 Cam engine tool pictures

#36 Post by Jacques Lefriant » Wed Mar 31, 2021 12:29 pm

tool of the day
thumbnail_IMG_6382.jpg
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Trevor Gates
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Re: 4 Cam engine tool pictures

#37 Post by Trevor Gates » Wed Mar 31, 2021 1:15 pm

Jacques Lefriant wrote:
Wed Mar 31, 2021 10:33 am
Hi Harlan
I really miss Billy he would answer my naïve questions and when i thanked him he would reply "my pleasure" i am hoping that with the current leadership that overtures can be made to the SoCal club to reprint his articles.
j
If you’re talking Jacques, I’m listening! I’m currently on the board for the SoCal 356 Club. Please tell me exactly what you’d like and I’ll bring it up at the next board meeting and try to make it happen. Rex is the editor and is one of the good guys.

PS - It was nice that you had those oldham couplers for Jack, he’s building a pushrod engine right now for Marco and Marco is writing about it in the SoCal 356 Club magazine.
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Jacques Lefriant
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Re: 4 Cam engine tool pictures

#38 Post by Jacques Lefriant » Wed Mar 31, 2021 1:28 pm

Hi TrevorI think the key is to convince Hal that we would be very gratefull for his help. And if you could get Jack to post i could just do 4-Cam nonsense.
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Ibrahim Kuzu
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Re: 4 Cam engine tool pictures

#39 Post by Ibrahim Kuzu » Thu Apr 01, 2021 9:26 am

Jacques,
Definitely, Haas 750 5 axis the tool....
Great idea for Bill Doyle's 4 cam articles .

Trevor,
Appreciate the time and afford you can put for the great info Billy did many years. Would be super if the articles can be available in Carrera 4 cam corner..
And
Respected the master Jacques and others help, we will be well educated .
IK

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Trevor Gates
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Re: 4 Cam engine tool pictures

#40 Post by Trevor Gates » Thu Apr 01, 2021 12:33 pm

Jacques Lefriant wrote:
Wed Mar 31, 2021 1:28 pm
Hi TrevorI think the key is to convince Hal that we would be very gratefull for his help. And if you could get Jack to post i could just do 4-Cam nonsense.
j
If the 356 Registry board has interest they can send me an email or call me and I can put it to our board to determine who has the photo rights; I believe Billy wrote the articles however I don’t know who took the pics - quite possibly Hal, but maybe not.

I keep working on Jack to post on the Registry again... Speaking of 4Cam “nonsense” :-)
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Jacques Lefriant
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Re: 4 Cam engine tool pictures

#41 Post by Jacques Lefriant » Thu Apr 01, 2021 5:59 pm

tool of the day
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Hi Harlan
this is my repurposed fire controll resolver calibrator. it can index at 10* camshaft and with the adjustment 2* min resolution. the extra finger follower is DLC coated rather than hard chrome.
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Jacques Lefriant
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Re: 4 Cam engine tool pictures

#42 Post by Jacques Lefriant » Mon Apr 05, 2021 7:43 pm

Hi
Hunger adjustable reamer set.
they even come in bigger sizes to line bore.
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Harlan Halsey
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Re: 4 Cam engine tool pictures

#43 Post by Harlan Halsey » Sat Apr 17, 2021 3:14 am

Here's some Carrera tooling I made a while ago. Can you guess what it's for?
IMG_0721 Carrera Fixture.jpg
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Bottom view.
IMG_0725  Bottom Carrera Fixture.jpg
IMG_0725 Bottom Carrera Fixture.jpg (1.69 MiB) Viewed 1703 times
This was before the DRO milling machine. Haven't got to the CC multi axis yet.

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Greg Bryan
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Re: 4 Cam engine tool pictures

#44 Post by Greg Bryan » Mon Apr 19, 2021 1:13 am

Harlan - we need a hint! :D
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Martin Benade
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Re: 4 Cam engine tool pictures

#45 Post by Martin Benade » Mon Apr 19, 2021 8:45 am

For holding a head while milling the cam cover surface?
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