Question for our engine specialists.
- DonCichocki
- 356 Fan
- Posts: 521
- Joined: Thu Aug 22, 2013 4:29 pm
- Location: Lafayette, NJ
Question for our engine specialists.
I'm trying to find the offset between the lifter bore and the cam lobe centerline on our 356 engines. My engine is in the car so no way to measure it.
Thanks!
Regards,
DC
Thanks!
Regards,
DC
- Martin Benade
- 356 Fan
- Posts: 12177
- Joined: Wed Nov 23, 2011 10:52 am
- Location: Cleveland, Ohio
Re: Question for our engine specialists.
What high tech plans are you making?
Cleveland Ohio
62 Cabriolet
56 VW
02 IS 300
04 Sienna
62 Cabriolet
56 VW
02 IS 300
04 Sienna
- Jacques Lefriant
- 356 Fan
- Posts: 4597
- Joined: Mon Dec 06, 2010 1:50 pm
- Location: Washoe county NV
Re: Question for our engine specialists.
hi Martin
i think he wants the offset that allows the cam to rotate. In the US the cam grinders normally put taper on the lobe. it is best to have a corresponding radius on the lifter so they rock when offered to each other. stock there is no taper or conical/radius lifters so the offset does the rotating.
j
i think he wants the offset that allows the cam to rotate. In the US the cam grinders normally put taper on the lobe. it is best to have a corresponding radius on the lifter so they rock when offered to each other. stock there is no taper or conical/radius lifters so the offset does the rotating.
j
- Ron LaDow
- 356 Fan
- Posts: 8092
- Joined: Wed Mar 26, 2008 11:45 am
- Location: San Francisco
Re: Question for our engine specialists.
Don, the C/L delta really isn't the issue in rotating the lifter; it's the amount of lifter which overhangs the lobe.
If a flat lifter is contacted full-width by a non-tapered lobe, it won't rotate no matter where the C/Ls are located.
If a flat lifter is contacted full-width by a non-tapered lobe, it won't rotate no matter where the C/Ls are located.
Ron LaDow
www.precisionmatters.biz
www.precisionmatters.biz
- Greg Bryan
- 356 Fan
- Posts: 3692
- Joined: Sat Oct 04, 2008 1:05 pm
- Location: San Pedro, CA 90732; Fallen Leaf, CA 96150
- Contact:
Re: Question for our engine specialists.
Don - I was looking at a case today and measured the offset and it appears that the lifter center line is about 0.5mm closer to the crank than the cam center line.
Greg Bryan
- Martin Benade
- 356 Fan
- Posts: 12177
- Joined: Wed Nov 23, 2011 10:52 am
- Location: Cleveland, Ohio
Re: Question for our engine specialists.
Don, did you want Greg's dimension. or measured perpendicular to that?
Cleveland Ohio
62 Cabriolet
56 VW
02 IS 300
04 Sienna
62 Cabriolet
56 VW
02 IS 300
04 Sienna
- Greg Bryan
- 356 Fan
- Posts: 3692
- Joined: Sat Oct 04, 2008 1:05 pm
- Location: San Pedro, CA 90732; Fallen Leaf, CA 96150
- Contact:
Re: Question for our engine specialists.
Ah - maybe I misunderstood the request. That would be harder to measure .... at least for me. =8^)
Greg Bryan
- Ron LaDow
- 356 Fan
- Posts: 8092
- Joined: Wed Mar 26, 2008 11:45 am
- Location: San Francisco
Re: Question for our engine specialists.
Yep.Martin Benade wrote:Don, did you want Greg's dimension. or measured perpendicular to that?
I assumed the question referred to a 'plan' C/L delta. I've always assumed the 'elevation' C/Ls were equal.
Ron LaDow
www.precisionmatters.biz
www.precisionmatters.biz
- Vic Skirmants
- Registry Hall of Fame
- Posts: 9276
- Joined: Tue Oct 27, 2009 5:02 pm
- Location: SE Michigan
- Contact:
Re: Question for our engine specialists.
Greg; I have never checked the vertical offset of lifter bore-to-cam bore. With each cam lobe operating an opposing lifter, I'm not sure how that would work. The 2-piece case engines used special lifters to address that issue. I will have to look at a case today when I get out to the shop.
- DonCichocki
- 356 Fan
- Posts: 521
- Joined: Thu Aug 22, 2013 4:29 pm
- Location: Lafayette, NJ
Re: Question for our engine specialists.
Martin, I was just curious as to the amount of offset.
Greg, that's the number I was looking for. For some reason I thought it was larger, thanks!
Ron, I'm now running a wide lobe cam with no taper and flat tappets, wonder how much rotation is going on?
The engine will come apart this winter for a cam change that has taper and radius faced lifters. Will be interesting to see any wear patterns.
Greg, that's the number I was looking for. For some reason I thought it was larger, thanks!
Ron, I'm now running a wide lobe cam with no taper and flat tappets, wonder how much rotation is going on?
The engine will come apart this winter for a cam change that has taper and radius faced lifters. Will be interesting to see any wear patterns.
-
- 356 Fan
- Posts: 4181
- Joined: Sun Apr 20, 2008 12:54 am
Re: Question for our engine specialists.
Don,
The C/line offsets of the tappet to the standard/regular camlobe is no more than 1,0mm; I didn't have a widelobe cam available.
Dick
The C/line offsets of the tappet to the standard/regular camlobe is no more than 1,0mm; I didn't have a widelobe cam available.
Dick
- Vic Skirmants
- Registry Hall of Fame
- Posts: 9276
- Joined: Tue Oct 27, 2009 5:02 pm
- Location: SE Michigan
- Contact:
Re: Question for our engine specialists.
Ron; do you have a good way to measure the vertical difference? I checked a case this morning and did see a difference in the vertical view. Admittedly, my technique was a little crude, you probably have a better way.Ron LaDow wrote:Yep.Martin Benade wrote:Don, did you want Greg's dimension. or measured perpendicular to that?
I assumed the question referred to a 'plan' C/L delta. I've always assumed the 'elevation' C/Ls were equal.
- Ron LaDow
- 356 Fan
- Posts: 8092
- Joined: Wed Mar 26, 2008 11:45 am
- Location: San Francisco
Re: Question for our engine specialists.
Just an eye-ball says they are awfully close, but I think a cam-bore slug with a cone end and a lifter-bore slug with a cone end, both dropped in place, should tell us. No time this evening, but it won't take long tomorrow on the lathe. I've got a case half on the bench.Vic Skirmants wrote: Ron; do you have a good way to measure the vertical difference? I checked a case this morning and did see a difference in the vertical view. Admittedly, my technique was a little crude, you probably have a better way.
Ron LaDow
www.precisionmatters.biz
www.precisionmatters.biz
- Ron LaDow
- 356 Fan
- Posts: 8092
- Joined: Wed Mar 26, 2008 11:45 am
- Location: San Francisco
Re: Question for our engine specialists.
BTW, how close a measurement do we need? No use getting one within .04" if you need .02".
Ron LaDow
www.precisionmatters.biz
www.precisionmatters.biz
- Vic Skirmants
- Registry Hall of Fame
- Posts: 9276
- Joined: Tue Oct 27, 2009 5:02 pm
- Location: SE Michigan
- Contact:
Re: Question for our engine specialists.
We might be talking about the .5mm Greg mentioned.