Bus stroker motor advice based on parts accumulated: 94x?

[kell1968]

When you going on this trip. My brother and I are planning on the same thing. We plan (hope) to do the whole Pan American highway. Would be cool to have a third. If we get tired of each other, well we all have our own vehicles... If we have a problem with one vehicle... Well we may have two more

[bugguy1967]

I believe the compression needs to be a tad lower with a single. Just making sure that you are aware of this.
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[travelvw]

Thanks,
K

[sactojesse]

[stingah2]

Kevin, if there's one thing about you it's that you are not normal. Normal is boring. I have run duals on everything for 20 years but for what you do I really can see and appreciate that a single is a great choice. I personally like your abnormal build
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[travelvw]

[sactojesse]

[luckystiff]

they do also offer chevy/buick journal'd but i think only in maybe 5.5, 5.6 or something like that. so yeah all longer choices.

oddly enough i ended up digging those up because CB was out of the unitechs when i was ordering parts. after dealing with them i wish i would have known that before i bought my crank from CB as i probably would have ordered my crank from them also. great folks to deal with, nice products for a reasonable price, and fast shipping. i ordered my rods on a friday and they were here the following monday....ken....
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[jfats808]

[luckystiff]

[travelvw]

Thanks again, great info. I will probably go with a single 44 and drop the venturi.

These are the specs on the cam I was most happy with:
Adv. Duration 274°
Dur. @ .050" 222°
Lift @ cam .359"
Lift w/1.1:1 Rocker Arms .394"

K

[[email protected]]

With a single IDF do not go bigger than 286 adv duration, which is the Engle W110, or SCAT C35. You need a venturi in the 32-34mm range. The 40 IDF comes with a 28, and the 44 comes with a 36. So in either case you need to make a carb change to optimize everything.
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[travelvw]

Ok, sounds like I've already got my rods. Great!

That's kinda what I was thinking about cam choice: what appears "bad" on a small engine, may work great on a larger engine... something I am not familiar with. That said, a 120 looks to be a little on the mid-to high, even in a big engine... also not really what I'm looking for. Might work better with dual carbs, but I'm running a single Weber IDF... so, what size? 44, 48? I am not running duals, even if everyone else in the world would .

C35 was a typo... I actually have the C45, which is not at all where I want to be on this build.

I will consider upping the CR. Curious as to what a typical ratio is with 82 and B's on a new case, no flycut?

I will likely have the case clearanced locally for an 82mm crank. Thanks,

K

[[email protected]]

SCAT rods are outstanding, all the "no-name" rods try to achieve SCAT's level of quality, and rarely do. They are an excellent choice, for another $20 over the generic versions.

5.4" is the proper length for an 82mm crank and B pistons. You will NOT have a loss of low end with a "big" cam because of the stroke increase. One counters the other.

I'd go with dual 2bbls and an Engle 120, and 9:1 CR. Will run very well.
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[luckystiff]

like the guy in the other thread about cam choice don't limit that stroker based on gas thats $0.20 cheaper per gallon. as i said in that thread you're talking $2-3 more per fill up for the ability to bump that cr in the 9:1+ range and use that engine like it can be. i know theres plenty of folks that have and do build low cr strokers. to each their own. theres also guy that build small HIGH compression engines putting out buttloads of power.

the scat c35 is pretty similar is specs to a engle 110. if the objective is to use as much of what you have it may fit into that low cr build range you are talking.

is the case stroker clearanced? if not you'll probably either want to send it to someone to be done so or i've heard several say that 82mm with buick journals and a nice set of H beams puts you in the by hand at home clearance range. cheaper to send the case out for stroker clearancing though...ken....
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[travelvw]

Thank you John, I will grab a set of thick 92 B's from you (94x94 cut), and an 82 stroke crank: 2180 it is! Perfect. I'm guessing this takes stock length rods 5.4" for a mild compression motor?...will the 4340 Scat I-beam set I have be a good choice? Does 8:1 compression sound about right to everyone for running cheap gas? My last few engine builds have been 7.8- 8.2:1, and they ran fine on 87. That said, the engine size was much smaller. I don't want to be creating excessive heat.

Any more info on cam choice... particularly valve lift?... what numbers qualify as "low lift", and how does that effect things?

Mark, unlike most folks, I don't need the power band up high. I want it to kick in right away and fade out by 4k or so. I do very limited interstate driving, especially in traffic. Again, not looking to limit myself, but put the power band in the right place for me: very low range to mid-high at most.

K

[mark tucker]

I built a motor for a guys SC ,it tends to see some rpm. as does his bus. do not cut your self off at the knees, it's not any cheeper but it can be disastorious.remember your foot governs the motor.use what you need when you need it. if you need it and dont have it,better hope that big truck has real good brakes&a light load, cause he's fixen to squash the crap out of you.......or pull away from him like he is in reverse.the choice is yours. build it right & it will last.

[[email protected]]

http://vwparts.aircooled.net/Piston-Cylinder-Set-92mm-x-82mm-Machine-In-p/vw9200t1s.htm

are 94mm head, and 90.5/92mm case

while

http://vwparts.aircooled.net/Piston-Cylinder-Set-92mm-x-82mm-Machine-In-p/vw9200t1ms.htm

fit a 94mm Case and head machining bore.
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[travelvw]

I don't plan on needing much power past 3500 rpm... probably won't even rev past 4k.

The j's I have look to measure about 1 3/8". Haven't chose the header/muffler yet. Sounds like I'm going to have to move up in size . I don't need anything fancy, as I'll have to customize for clearance and will probably beat it on rocks anyhow.

It looks like 82mm is the "easy" B piston builld... I originally thought it was 78mm.

92mm thick B's are preferred if it fits my heads. I'm guessing they are 90.5mm case, 94mm head?

Thanks for the cam duration advice. Why ratio rockers? I thought they directly relate to the cam and lift and were a "patch" instead of changing out the cam?

K

[mark tucker]

thick wall 92's and 82 stroke,.040" deck(piston to head clearance) low lift cam around [email protected] & 1.25 ~1.33 ratio rockers. add the extra oil galy&slot the lifter bores.deburr the lobe edges.