The Cal-look Lounge

I just torn down my daily driver motor. 1679 (69x88) with ported semi hemi heads. It looked good other than the lifters pitted and burning some oil. I ran the timing total at 30-31, not as high as some with semi hemi cut heads and it ran fine. My question is I had a engle 110 in it and was thinking of trying something else. maybe going down to a 100 and try to get more mileage out of it.
the carbs are 40 idf  and like I said it ran fine, 27.5 to 31.5 on the mileage.
any suggestions. I also had stock rockers on it and was thinking of trying a 1.25 ration rocker???
 thanks

you can stay with a 110 but maybe the carbs are a bit big (depening on the venturi's) i would fit 28 vents. i will try to build a 1641 with a w100 for a type3. it will however be with stock carbs. hope to be able to have some more info in the next few weeks.

By those figures, looks like the motor was running pretty well. Stock valves? I would just bump the compression to 8.5:1 and install 1.25 rockers- if the heads are ported well, you should see a noticeable increase from the extra valve lift.

Dont install 1,25 rocers on a W110 cam, unless you accept that you need to replace valve guides on a rather regular basis. And I mean often. also, you need dual springs.
As for the mileage, well, I do not think a downgrade to a W100 would do much of a difference on that account. If you chase mileage, go for the CB 2280. One of the best cams on the market today for that.
T
Come to think of it, even I  ::) would seriusly consider keeping the W110 in an engine with semi hemi heads. You need that dynamic compression the W110 can deliver to make good power in the lower rpm.
On a 1680 and 40 IDF´s the venturisize should be 30 mm. IMHO. And 32mm. for max power, but you will most likely experience a little off idle stumble if you do that.
T

I just had a pair of heads freshened up that used the 110/1.25 combo (going to a larger bore, more CR, 120 cam), and the head builder said the valve guides showed no unordinary wear... this was after maybe 30-40k miles. Just my two cents ;)

I have seen heads with that combo wear out after less than 10000 miles on more than one occasion.
T

Zack,

If you go to 1.25s, use the VW style that look like stock rockers, trim the rockers so you can get a little more clearance between the bottom side of rocker between the top of the valve stem and the rocker and run the 911 style adjusters.  It is true that scuffing type high lift rockers will side load the valve stem and create a little more guide wear sooner. So, if you run an adjuster type that does not want to put a thrust load on the valve, you will not see near the wear. I have found this successful for getting more miles out of a set of guides and noticed it worked for others doing the same thing.

I am running 1.25 factory style rockers right now on my 1914cc motor with a 110 cam with the courier style adjusters, which I will measure to see how well they do compared to the 911 elephant foot style.  I am not running dual springs on this motor with 40 x 35.5 valves and my ported heads.  I do not run the motor over 4500rpm as a driver motor and chose to go with HD singles.  It runs great, has a lot of bottom end and is a great driver motor.  If I had intentions of bracket racing it I would have put dual springs on it.  30+mpg on the freeway.

Your welcome to check it out whenever I am at a show with the chop top.

Rick M

Nothing wrong with keeping the 110.... it's a great all purpose cam.  In the old days, it was the cam choice for many of us.  You got good all around drive-ability with a two-barrel, Kadron's, or even IDA's with a smaller displacement engine.  As for using ratio rockers with a 110, I "personally" wouldn't do it.  Save those for a cam that's ground specifically for high lift rockers... but that's just me.  $.02

That's what was on it (the stock style 1.25s), and that's what will be going back on it with the 120 cam. Dual springs here. Thanks for the info Rick :)

Engle 110 is fine

Web 218 would be my choice.

Have I been giving you some idea's dude  ;) :) This is similar to what I am doing this winter - checkout this thread  :)

http://cal-look.no/lounge/index.php/topic,6900.0.html  :)