how wide will mtr. grow with 86mm crank-5.7rods compared to 1600

[vw moses]

wondering what the diffrence accross the case (valve cover to valve cover)
would be, as compared to my stock 1600 width now.
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73 thing-gone
66 beetle-gone
62 beetle-gone
57 beetle-gone
convertable-beetle-w/bugspray & screamer dist.(019) gone
"Where There's a Will There's a Way"
63 one of a kind beetle. 57 dash,double rear window--sweet!

[SamT]

my math says about .8" wider is a good guess. Assuming B stroke Pistons.
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http://www.thesamba.com/vw/forum/viewtopic.php?t=546712

[vw moses]

is that about a 1/4 "or 1/8"?
i will use the b pc's
that seems not too much. which is good.
_________________
Youtube@vw moses
73 thing-gone
66 beetle-gone
62 beetle-gone
57 beetle-gone
convertable-beetle-w/bugspray & screamer dist.(019) gone
"Where There's a Will There's a Way"
63 one of a kind beetle. 57 dash,double rear window--sweet!

[dirtkeeper]

[maui]

Almost 1/2inch each. side.

[vw moses]

very good, should of known that measurement.
good info. if i build that combo it won't be "that" bad fitting in mtr. compartment. Thanks!
_________________
Youtube@vw moses
73 thing-gone
66 beetle-gone
62 beetle-gone
57 beetle-gone
convertable-beetle-w/bugspray & screamer dist.(019) gone
"Where There's a Will There's a Way"
63 one of a kind beetle. 57 dash,double rear window--sweet!

[bugguy1967]

There are always C height pistons if you need closer to standard width.

[jpaull]

Sweeet! Build it!!
Let us know the progress!
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[email protected] MPH 1/4 Mile & 8.1 @ 83.7MPH in 1/8 Mile with Mild Type 1 VW Mag Case 2234cc commuter engine in stock weight bug w/only .491 total lift(CB2292 Cam), 42x37 heads, 48idf's, Street tires, Belt on, Mufflers, Pump gas, video of the run here: https://youtu.be/M3SPqMOKAOg

Transmission by MCMScott:
Rhino case, Klinkenberg 4.12, Superdiff, 002 mainshaft with 091 first idler. Weddle 1.48 Third & 1.14 Fourth.

[Dougy Dee]

Just completed one. 1/2" per side.
Longer cyl's.
Longest Scat PR tubes
Longest everything.
Cyl tins need spacers.
Fan shroud needs widening.
It seemed like it would never end....

[vw moses]

i was looking at the Rod Ratios for different rod length w/crank strokes(page 34 in keith seume engine interchange manuel)
and with the 86mm crank. w/5.7"rods was 1.68.
within the reconized range of 1.65-1.70 according to some performance builders.
that sastic swayed me from 78mm w 5.7 witch is in 1.85 range
so i'm entertaining a 86x94 w/5.7 mtr.
_________________
Youtube@vw moses
73 thing-gone
66 beetle-gone
62 beetle-gone
57 beetle-gone
convertable-beetle-w/bugspray & screamer dist.(019) gone
"Where There's a Will There's a Way"
63 one of a kind beetle. 57 dash,double rear window--sweet!

[modok]

crank center to piston top
half stroke plus rod plus pin height
stock34.5+137+39.5 =211
you43+146.5+35=223.5

223.5-211=12.5 more
so, "width" piston top to piston top
12.5x2=25mm aka .98 inches

86 stroke you need extra long cylinders
but you might use stock cylinders if you can get a "c-piston"

if your just doing a rod ratio experiment why not
80 and 5.325 rod?
82 and 5.4 rod?
84 and 5.5 rod?

[mark tucker]

go with shorter pin hight. my 86 with 5.6 is short so... those 5.6 rods will probably go in to my 84 stroke and 5.7's in the 86. there are many diferent pistons with many diferent hights and diferent dishes or ft these days.and when you buy them for a v8 instead of a vw....there cheep. manley, diamond, dss,mahle motorsports and more.

[jpaull]

[mark tucker]

as I recall my old v8 with 84mm stroke had...6.123 rod length...worked pretty good. my 4.5" stroke v8 has a 6.535" crower billet rod ( as my old brain recals) ...it works pretty good too.the biger the engine the less it matters for a power stand point. more of a on the shelf thing and piston combo/weight thing. but that was big motors...these arnt big motors. even though I like the longest rod I can stuff in there....withen reason.

[jpaull]

[DeathBySnuSnu]

I was a mopar guy back in the day and usta swear by the long rod theory. But now a days I dont find a lot of difference. Yes there is a difference but it is hard to quantify.
I will say this. A short rod motor seems to be less picky about being over cammed. Where a long rod is more specific and less forgiving on the cam grind.

[modok]

Bingo
long rods will give you less side load on the piston,
and better if headflow is limited BUT

Today oil is better, pistons are better, and cnc heads that flow huge are affordable. Not much holding you back

[vw moses]

i'm thinking jaycee cut to length cylinders w/wisco pistons
set the deck that way. not quite sure of how to measure barrel length.
during mock up i'd need a 94 barrel to see how much the piston would stick out @t.d.c.
my goal is a high torque low rev. beast. of a motor.
_________________
Youtube@vw moses
73 thing-gone
66 beetle-gone
62 beetle-gone
57 beetle-gone
convertable-beetle-w/bugspray & screamer dist.(019) gone
"Where There's a Will There's a Way"
63 one of a kind beetle. 57 dash,double rear window--sweet!

[modok]

No need to assemble it, just measure the parts and use math.
That's how the whole rest of the wold does it, seems to work

[Eaallred]

1/2" wide per side doesn't seem like much to fit in until you try to fit it in there.

I have a 2387 with 5.7 rods in my sandrail. The tins fit so bad, the extra width is huge. There are half inch spacers between the shroud and the cylinder tins.

To fit this engine into a full bodied car, I could see valve cover clearance to the body being a huge deal, after trying to figure out how to get the cylinder tins to fit within the body and engine seal.

It can be done, and people have done it. Just be ready for some real time spent making it work
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Eric Allred

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