New Heads and 1.25 Rockers?

[67rustavenger]

[mikelars]

Ok, well they said build time was 2-3 weeks, but then I changed the order to ported SuperStock 94s with dual springs - so who knows how long it will take.

I am going to try my new 1.3 main jets in the Weber 40 IDF carbs - just replacing the 1.15 and leaving the 28 vents and all else the same.

Is this pretty easy to do with the engine in the bus? I am hoping this is like a 25 minute job, just to see if I get something noticeable out of it…
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2332 Torque Motor Build
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Engine Rebuild 1968cc Playlist:
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[sled]

[mikelars]

Hmm - steps 1 and 9 seem tricky. That will certainly take 25 min…
_________________
Here is my 1961 Beetle Restoration:
https://www.youtube.com/playlist?list=PLW_2wBCs4Ny2qXEPvdnfvEzN42T8JA8zO

Here is my 1966 Split Bus - Restoration Channel:
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2332 Torque Motor Build
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Engine Rebuild 1968cc Playlist:
https://youtube.com/playlist?list=PLW_2wBCs4Ny1JbZ2EgJQQ2awfo0koZRqz

[Danwvw]

[mikelars]

I am changing out the 90.5s for thick wall 92s, so it will go from a 1904 to a 1968. But with that I will have ported SuperStock heads 37.5/32, and a 32 Venturi and 1.45 main jet. I have the option of trying 1.25 rocker arms (I ordered the arms) because I got dual springs on the heads. But I was advised not to use 1.25s with a 218 cam.

But it will be 4-5 weeks before I get both the heads and 92 pistons, so in the mean time, I have a 1904 with stock DP heads (AA500) and a 28 Venturi with 1.15 main jet. So I got a set of 1.3 main jets coming on Monday I will just pop in for the 4-5 week wait…

Looking forward to isolating a pesky oil leak (about a nickel drip per parking), painting and sound insulating behind the fuel tank. I think I might try more clear coat inside the engine compartment so some of the engine grime wipes off more easily…
_________________
Here is my 1961 Beetle Restoration:
https://www.youtube.com/playlist?list=PLW_2wBCs4Ny2qXEPvdnfvEzN42T8JA8zO

Here is my 1966 Split Bus - Restoration Channel:
https://youtube.com/channel/UCPBRysmvrJlif2wzwEwiuwQ

2332 Torque Motor Build
https://youtube.com/playlist?list=PLW_2wBCs4Ny2HwsKM9QT4LFpcSqP3QG0p

Engine Rebuild 1968cc Playlist:
https://youtube.com/playlist?list=PLW_2wBCs4Ny1JbZ2EgJQQ2awfo0koZRqz

[Danwvw]

Probably the setup you have could handle 30 or 32 mm venturi's just fine, the thing to watch for is a crossover stumble or loss of low end torque. Kind of got to drive it and see how well it pulls uphill in 3rd at 25mph. I have the Dell 36X30mm drla's on my bus with a Webcam 163 that has 250' and .420" valve lift. But on the other (74mm 88mm engine) with 40x28 Webers and 1.25 rockers with the webcam 118 it comes out like a webcam 218 only my ratio rockers are giving it .460" valve lift. I think it's the better performing engine for sure.
That 1968cc is my dream engine for a bus. There are better 1.25 Rockers that you could get but I don't think your going to need the 1.25's with the Webcam 218 as it's a nice 242' and .455" lift. If you try the 1.25 ratio rockers it's going to need racing pushrods (that you may already have) and it's going to need a little more space at the (pushrod tube mouth) to not rub there.

Here is a Photo:

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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[mikelars]

Interesting - well on Monday I will have 32mm Venturis and 1.3 main jets AND 1.45 main jets. So I could try my 1904 setup with 32/1.3 for a month, and then once the 92s and SS heads arrive, move to 32/1.45.

I will tinker around - I am excited for the heads to get here but need something easy for the next 4 weeks.
_________________
Here is my 1961 Beetle Restoration:
https://www.youtube.com/playlist?list=PLW_2wBCs4Ny2qXEPvdnfvEzN42T8JA8zO

Here is my 1966 Split Bus - Restoration Channel:
https://youtube.com/channel/UCPBRysmvrJlif2wzwEwiuwQ

2332 Torque Motor Build
https://youtube.com/playlist?list=PLW_2wBCs4Ny2HwsKM9QT4LFpcSqP3QG0p

Engine Rebuild 1968cc Playlist:
https://youtube.com/playlist?list=PLW_2wBCs4Ny1JbZ2EgJQQ2awfo0koZRqz

[mikelars]

How can I calculate the lift of a 218 cam with 1.1 and 1.25 rockers? Just want to look at the numbers…
_________________
Here is my 1961 Beetle Restoration:
https://www.youtube.com/playlist?list=PLW_2wBCs4Ny2qXEPvdnfvEzN42T8JA8zO

Here is my 1966 Split Bus - Restoration Channel:
https://youtube.com/channel/UCPBRysmvrJlif2wzwEwiuwQ

2332 Torque Motor Build
https://youtube.com/playlist?list=PLW_2wBCs4Ny2HwsKM9QT4LFpcSqP3QG0p

Engine Rebuild 1968cc Playlist:
https://youtube.com/playlist?list=PLW_2wBCs4Ny1JbZ2EgJQQ2awfo0koZRqz

[Danwvw]

I just multiply 1.25 or whatever (my rockers measured 1.3) X the cam lift. When only valve lift is given cam lift is (Valve Lift/1.1) ACN has the Cam Duration and Lift Specifications. Also the webcamshaft.com Site has all the cam cards for their Type 1 VW cams:
_________________
1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[mikelars]

Ok so for the 218 cam I see

.459/.422 Valve Lift
280°/276° Duration

So 1.25 would be:

0.459 / 1.1 = 0.4172 cam lift
1.25 x 0.4172 = 0.522 valve lift with 1.25s?

Is this what I am looking at for a 218 with 1.25 rockers?

I am actually not sure since it says valve lift and has two numbers .459/.422 - so which is the valve lift?
_________________
Here is my 1961 Beetle Restoration:
https://www.youtube.com/playlist?list=PLW_2wBCs4Ny2qXEPvdnfvEzN42T8JA8zO

Here is my 1966 Split Bus - Restoration Channel:
https://youtube.com/channel/UCPBRysmvrJlif2wzwEwiuwQ

2332 Torque Motor Build
https://youtube.com/playlist?list=PLW_2wBCs4Ny2HwsKM9QT4LFpcSqP3QG0p

Engine Rebuild 1968cc Playlist:
https://youtube.com/playlist?list=PLW_2wBCs4Ny1JbZ2EgJQQ2awfo0koZRqz

[modok]

Web 218 has about .420 lobe lift

Are you looking at a 218/119 split grind?

[Danwvw]

I reverse calculate .5216" or .525" lift and ratio rockers are a little off my Scat measured 1.29 so maybe .538" or more valve lift. It's pretty simple to measure durning mock-up.

_________________
1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[mikelars]

[sled]

[mikelars]

[Dougy Dee]

Ask your head guy what the optimum lift is for a 37mm valve.
Probably less than .490...So anything higher is a waste of spring.

[Brian_e]

Is this a road trip bus you are planning to put a lot of miles on, or will it stick to driving across town for ice cream?

I don't think the ratio rockers and extra .060" lift are worth the extra wear, and noise. Sure it will work, but I am guessing your 1.25 rockers will really measure out to over 1.3, and the 218 is not designed for large ratio rockers. I have built lots of engines with a 218 and stock rockers. It works great every time, runs quiet, and I don't need to worry about it being over stressed.

My 37x33 heads will flow just past .525" and they start to taper off. I would imagine Tims are similar. If it was going into a ripper fun bug, I would say use the extra lift, but at that point, I would also be using a different cam.

One of the major keys to a long lasting successful engine is make sure none of the parts are over stressed, or working past their designed limits. If you want it to last.....Don't try to push the limits of everything.

Brian
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www.type-emotorsports.com

[Danwvw]

Not terribly extreme but the dual valve springs will be rough on the cam and lifters. Cam and lifters can sometimes fail to break-in without galding. Good oil like VR-1 or add ZDDP "Zinc" to your oil. I would think that swivel feet adjusters would save Valve Guide Wear. A better way to achieve this much lift is with Ratio Rocker Cams. Also be sure the valve doesn't hit the head. I would use something like a putty to check it doing a mock-up! And! make sure that the dual valve springs don't bind any. Maybe consider breaking the cam and lifters in with the 1.1 ratio rockers. first.

_________________
1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[mikelars]