Small stroker engine for bus at altitude

[modok]

The pistons will clear 78mm stroke with a stock rod, or more.
I've checked myself last time the question came up.

[Alstrup]

Rich, I did´nt realize it the first time around. But the reason to you not having much trouble with that small a header is because you have such a limited intake side. The intake simply does not feed enough for the exhaust side "to get in trouble" so to speak. John and Modok apparently caught it, so I must be a bit slow
Chris, when you want to keep the stock heaterboxes I would suggest that you use a straight pattern cam, because at some point the exhaust side kinda need the lidft and flow. (It does of course matter a little what the end combo will be) But it should be taken into the equation.
WRT induction. As said the centermount 32 NDIX is actually rather limiting wrt power, unless it sits on a plenum (ram) type manifold Then its a somewhat different matter. Then the restriction becomes the end castings. but we can do somthing about that
Since its a bus, and you live at some altitude, I would suggest the largest displacemet that "I" find reasonable for stock heater boxes. Also I would use an exhaust that improved lower rpm torque most. That would be the BAS customsport. I have recomended it before, but it is THE best muffler of its type for that kind of engine, - and - it is also the most quiet one. http://www.ahnendorp.com/VW-Kaefer-Typ-1-Motorente...-1830.html
T

[cdollar]

Thanks for the replies!

I'm still undecided on the induction side. I haven't found an isolated runner manifold for a 32 NDIX that looks like it will fit in my engine compartment, and doesn't looks like it has been used as a hammer. The current fit of the NDIX on my SP manifold is REALLY tight to the top of the compartment. I have no experience with the plenum style manifolds, but I was under the impression that isolated runners would be best for torque and low RPMs.

So the lack of options for an NDIX manifold has me looking at other options. A single IDF or DRLA on a CB low profile manifold would work. I'm also still really intrigued with the modified 34pict setup. I've done a lot of searching on that here in the forums, and my only concern in going that route is that I don't want to get in over my head with carb modifications. I'm fine with jet changes and all, but things like modifying passages is probably beyond my skill set. I've seen the "super stock" 34pict3 that ACN sells, but based on my searches it seems like a 29-30mm venturi was needed for something like a 1968-2020cc, and the ACN one has a 28mm. I guess I could always just match my displacement to the carb.

And the BAS looks great! I've been eyeballing that since I started thinking about this engine. But man is is pricy! If there's any way I can fit it into my build I will, but I may have to start with my existing header as long as it will work with whatever combo I end up with.

I guess I need to finalize the carb question before I can move on to other parts of the combo. Thanks again for all the guidance here, guys. I really appreciate it!

[richparker]

[cdollar]

Hey Rich.

Yeah, you've got a great combo, no doubt. Its all about climbing the mountains to me, and your bus does that with ease, and keeps things cool. Great combo. Shoot, you're getting better temps than I am in my 1776! I'm getting a couple MPG better than you, but I'm willing to lose some MPG if I can gain some climbing power.

I didn't realize that you had run a modified 34 pict on your 2109, and that JAD John had done the work on it for you (or I just forgot... you know me). That's really interesting. Going with the pict would let me ditch my buggy throttle cable setup, and I'd gain an automatic choke for those cold mornings. I'm really considering it.

We're going to be in Durango later this morning, hitting Ska for lunch around 11:30 or so. If you're in that part of town swing by and I'll buy you a couple beers. I'd love to hear more of your experience with that 2109 and 34 pict.

[richparker]

I was planning on going to Ska for lunch too, see you there.
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[volksnhousin]

My thoughts on this: Use a 34 pict with a slightly modified venturi. I would use stock size valves with your stock heater boxes. You don’t want to rev it much over 4,000 rpm so I think your possible cam choices should be something like: stock, cb performance 2280, scat c25, or engle 100. You could add bigger rockers to the stock cam if you wanted to.

I was thinking of an engine that kind of runs like the first combination this guy built. This engine was 2110cc, stock valve size, dual single throat carbs, and c25 cam. There is a dyno run video and sheet on page 3 of the write up.
https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

Andy

[cdollar]

Yep, the modified 34 pict is the route I'm going to go. I should be able to get all the power and torque that I need out of it, and it will keep everything simple. Win win. And a CB 2239 for the cam, with Steve Tims 37.5x32 super stock heads, tight deck.

Time to buy some parts!

[Sinklar]

Any updates on this build? I'm living in Santa Fe and have similar requirements. High elevations with big climbs. I'm looking to build something for my 60 Double Cable with a big nut transmission with RGBs.
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Never argue with stupid people. They will sink you to their level and beat you with experience.

[big bus mike]

[bugguy1967]

https://www.thesamba.com/vw/classifieds/detail.php?id=2248587
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"A petrol engine can start readily, run smoothly and give every appearance of being in good order, without necessarily being in good tune." - Colin Campbell, "The Sportscar Engine"