'One takes all' short block...

[xavier]

Let say I have a 74 crank and 88 PCs set. And let say I want to be able to swap heads and carbs at will from single port/single 2bbl carb to dual port/IDA.
What would be your cam choice?
Xavier

[TexasTom]

FK89!
 

[TexasTom]

Seriously though ... my first though was an Engle W120.

[Dave Rosique]

Seriously though ... my first though was an Engle W120.

Ditto!

   

[Zach Gomulka]

Why?

[xavier]

120? With SP AND single central carb(2bbl)?
I remember reading on this forum about cam overlaping with such a combination? Dyno used a 120 with SP but had Kads...

[TexasTom]

120? With SP AND single central carb(2bbl)?
I remember reading on this forum about cam overlaping with such a combination? Dyno used a 120 with SP but had Kads...

Is this just 'an interesting question', or are you REALLY considering this? Because ... it's a pretty goofy question. Unless your trying to fit into two very specific racing classes, why would you want to do this?

As for the 'why?', this is a very good middle of the road cam choice. It borders on the outside of the possibilities of your 'single' carb choice ... by the way, you didn't actually choose a carb! Zenith? 40DCN? 48IDA? Weber progressive? Plenum manifold or split runner? Until you get more specific, anything can be thrown out there ... Back on track >>> It will also be a good introductory cam (especially with 1.25: rockers!) for your dual port heads and IDAs. With compression set around 9 to 9.25:1 you'll have an very responsive engine with good off idle torque and decent power to 6 grand, maybe a little higher. Since you have two sets of heads, there could be 2 different compression ratios due to differing chambers ... yet another variance that is unknown.

 

TxT
... in the dark, as usual ...

[Sarge]

Back in the day, it would have been an Engle 110 with stock ratio rockers... at least from where I sat.

[Zach Gomulka]

My "why" was directed at Xavier, as I really don't understand the need for a motor like this.

I second the 110. Use 1.25's with the IDA's/dp heads. It will work ok in the single port, and really well with the IDA's and dual ports. IMO, the 120 would be better suited for a larger displacement.

[TexasTom]

I disputed myself over the 120, but I simply like it over the 110 ... personnal preference.
I think the IDEAL cam would actually be right in between the two.

W115?
LOL
 

[xavier]

It will definitely get built!

[ Attachment: You are not allowed to view attachments ]

So single carb will be a Holley 2110 on individual runner intake. CR? As I will not race it I will keep it under 9:1.

Why? I am kind of carb pervert and would like to use them all but cannot afford to build multiple engines.

So should I go for the 110(or similar)?

Xavier

[TexasTom]

New recommendation ... stay with Old School  >>>

Norris 336S

TxT

[Zach Gomulka]

Do yourself a big favor and trade that Holley in for a Zenith. You'll be glad you did.

I'd run 8.5:1 max with the sp, 9+:1 with dp. The 110x1.25 with good dp heads and IDA's will allow 6k+ rpms.

[Nico86]

What about one of these : http://www.vwparts.net/SLRCAM.html

[Dougy Dee]

It's tough enough finding a cam to optimize the flow characteristics of one set of heads and carbs but you are trying to do two...
Anything you pick will compromise one or both sets. That said a VZ15 would be my choice but make sure both sets of heads have great dual springs.

[j-f]

There is a feature in the Hot vw's from february 75 about a 1800cc engine with a single NDIX.

Specs are;

CB 88 mm slip in barrels and 74mm crank assembly (included modified late rods (311))
CB 272 cam kit.
stock dual port heads.
Zenith 32NDIX and plenum manifold.
1.4:1 rockers arm.
Bug Spark dual points distributor.
stock flywheel and clutch.
4-pass oil cooler and power pulley.

In this form it put out approximately 90bhp @ 5200rpm.

sounds nice and period correct. 

[xavier]

Do yourself a big favor and trade that Holley in for a Zenith. You'll be glad you did.

I'd run 8.5:1 max with the sp, 9+:1 with dp. The 110x1.25 with good dp heads and IDA's will allow 6k+ rpms.

I am working on that Both have pro and con I will compare them on the road.

Should I run the Zenith on a separate runner manifold or plenum with SP heads?

Xavier

[xavier]

There is a feature in the Hot vw's from february 75 about a 1800cc engine with a single NDIX.

Specs are;

CB 88 mm slip in barrels and 74mm crank assembly (included modified late rods (311))
CB 272 cam kit.
stock dual port heads.
Zenith 32NDIX and plenum manifold.
1.4:1 rockers arm.
Bug Spark dual points distributor.
stock flywheel and clutch.
4-pass oil cooler and power pulley.

In this form it put out approximately 90bhp @ 5200rpm.

sounds nice and period correct. 

I will have a look at that one. Thank you!
Xavier

[xavier]

Will stock 'reworked' rods be enough for the DP set-up(with IDA)?
74x88
110(or similar) cam
DP with around 9:1CR
IDA

Xavier

[Zach Gomulka]

Stock rods will be good. I recommend a PO10 Zenith 32 on an individual runner manifold.