New 1904 - Guidance please

[Hustlers67]

76 it is!!

[Hustlers67]

Next question. What are the best rods to give me the least hassle, using the A pistons and a 76mm crank?

5.325 H Beam? Any brand recommendations? Best bolts?

[Danwvw]

Do you already have the A Pistons & Cylinders?
The short rods 5.325" rods work with the 74mm crank and A pistons but with a 76mm crank your going to need the B pistons or a lot of shim (about .100") under the cylinders and longer push rods even with the short 5.325" rods your engine will be a little wider too. That's why I used the 74mm crank. Didn't want to mess with the push rod length and wanted to run the A pistons.

John explains it here just below the picture of the rod in the case: http://www.aircooled.net/1800cc-vw-engine-no-machine-combo/

As far as rod bolts the CB Performance 3.325" 5.325" H-Beam racing rods and the AA Performance 3.325" 5.325" I-Beam come with their own ARP Style bolts as shown in the photo in Johns article above. But the I-Beam rods have a larger bolt that won't clear the case as well as the H-Beam ones which came with the 3/8" Rod Bolts. I'm not sure I trust the Rod bolts that came from China with the AA-Performance 5.325" I-Beams!
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[Hustlers67]

[deadkombi]

Go the CB performance H beams. They finish hone them and have proved good for me.

[Danwvw]

I used the H beams from Air cooled Net on my last rebuild they were the CB-Performance H beams. Had them check for balance end to end and total but they did not need anything. They are a very nice rod.
On the engine I am building now I ordered the $139 Chinese manufactured AA-Performance I beams for it. Just got them out last night and started looking them over and they need some de-burring and from the looks of them they will need considerable work to balance. Wish I had another set of H-Beams instead!
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[modok]

WORD. Try a pin in those I-beams. I had to hone the small ends. and the bolts seemed to be 12.5mm.

[Hustlers67]

So it looks like the title to this thread may change.. It may be becoming apparent I am not in this with a particular dream spec engine. I am in it for the challenge, the experience and learning, plus I enjoy parts hunting... and as luck would have it, I got a sweet deal on some CB 044 heads (40x35, dual springs) and a 78.8 c/w crank (which according to some of you appears to be forged and worth a go). Interesting twist is, the heads are cut for 94s ... so looks like all I need is some bigger carbs and I have bits that better match the cam. Trick now is making it all work...

Modok, you say 92s clear a 78 crank.

[modok]

my 5.3" rod is .025 thou shorter than any currently made, and your crank pulls the piston only .015 more, so actually you'd have MORE clearance.

You CAN use A pistons at 78.8 stroke, but no more. I would be best to use .060 copper "head gaskets" to allow you to run the piston all the way to the top. Short rods will help keep the engine as narrow as it can be.
I would not want to do this with thinwall cylinders!

AA thickwall cylinders are available to fit "94" or "90.5/92" case size, but use 94 size heads. I think you should get the cylinders in hand and measured before deciding what rods to buy,

[Hustlers67]

of course.. the 92 thickwalls are the same size as the 94s eh, so no copper wire trick needed.

[Hustlers67]

I should have said 94 B p&cs.

As if I have to get a new set of p&cs it will be the stroker ones. That should fix up the rod selection issue.

[modok]

yep, but with all the options I don't know if you'll want 5.325, 5.4 or 5.5

92b mahle pistons in AA cylinders is kinda cool too. good 92b pistons are actually the most common size to find good used.
I do not know if this is because they lose ring seal so fast or because the guys that DO want to build a thinwall stroker just tend to build time bombs anyhow.

[Hustlers67]

Thanks modok that's good to know. And no, not planning on building a time bomb, which is why I'm fleshing it all out here before I get too deep.

I couldn't find a build sheet, or thread that has 94b x 78.8.

'B' pistons will make the assembly and width issues a whole lot easier (when compared to the fiddle with short rods and 'a' pistons), right?

I'd like to keep it as close to stock width as possible.

[GTV]

2187cc, cool. Closest to stock width will be 5.4" rods. 5.5's will also work and only make the engine ever so slightly wider (once you account for proper deck height), but when given the choice I prefer short rods and slightly narrower over slightly wider. Pin heights between AA's and Cima's are also 1mm different, so you'll have to account for that as well.
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EMPI Power Rules!

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92B pistons are fine, it's the 92B cylinders that were a problem (THIN WALL). So it is an option to buy a set of used pistons, and then buy some new thickwall cylinders to complete the package on the cheap.

http://vwparts.aircooled.net/AA-92mm-Cylinders-THICK-WALL-94mm-Head-92mm-Case-p/vw9200t1kl.htm

[Hustlers67]

Thanks for clarifying that John, that makes sense.

GTV, yep 2187 - an unusual number, its a long way from 1904.. I think slightly narrower would be better too.

Lots of measuring to do!

[Hustlers67]

I am on the hunt for Carbies:

With this set up (2187cc) - I am looking out for:

- Weber IDF 44s
- Dellorto DRLA 40s
- Dellorto DRLA 45s

I know jetting is the variable - but I just want to get the best base unit. I also understand the jet access benefits on the DRLAs (over the IDFs).

Would the DRLA 40s be too small?

[[email protected]]

IMO 45s are a bit too big. The 44 IDFs or 40 DRLAs will work very well.
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[modok]

40 DRLA are about perfect for conservatively ported 40mm intake valve heads.

[Hustlers67]

Hi Again,

I should probably change the name/title of this thread to "2187 guidance please" any ideas how to do this?

Anyway - I got some Dellorto DRLA 40's. They are in good condition and appear to be straight off an Alfa Romeo?? The Jetting is:

Vents: 32
Air: 180
Main: 142
Idle: 52

From my search of comparative setups - this doesnt appear too far off the mark?? Maybe a bigger idle jet is needed?

I will need a filter set up and a linkage. Are velocity stacks essential?

I am not sure what if any modifications will be needed to make them work for a VW - I have seen Jet Dr's and other things referred to and will need to research them. I plan on getting the Dellorto Superformance book and doing some reading. Any other suggestions?

I am also conscious that untested carbs are not a wise move for engine break in... but TBH I am a long way from there!

Slowly slowly