Robbie is building another engine…

[Clatter]

Well Awlright!!

I end up in the same boat;
A motor that has plenty of reasons to be pulled out and apart,
But none of them pressing,
And another here all built up ready to go save for an excuse to do so..!

Just like a counterweighted crank,
A dynamic balance job is a plus for any motor.

Kind of like Hoover oiling mods,
Or single springs,
Or solid shafts,
Or swivel feet,
Or a deep sump,
Or full-flow,
Or.. Or..

Down the rabbit hole we go...


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Bus Motor Build

What’s That Noise?!?

[airschooled]

Re: RPM

forgot to attach this:

_________________
Learn how your vintage VW works. And why it doesn't!
One-on-one tech help for your Volkswagen:
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[telford dorr]

[airschooled]

[SGKent]

Seems like the common rev limiter was about 5200 RPM. New stock springs will easily go there but not much more. MY 71 DP had hd single springs and original springs at various times in its life. It could turn 6,000 RPM for hours on end. That is why it would only last 40,000 miles between something starting to fail like studs pulling. Stock crank that had been balanced professionally. almost 500,000 miles on two cranks. First one the shims cut to the dowels one night running in deep water. I was always more worried about the mass of the lifters, pushrods and rocker arms causing issues. They are actually pretty rugged engines.
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“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[notchboy]

[cdennisg]

[telford dorr]

[Abscate]

DPR Balance’s Fan’s and DPRK Un Balances them?
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.ssS!

[airschooled]

[telford dorr]

I've heard / seen it before. Old Chevy 283 with worn cylinders had a noticeable ridge at the cylinder tops. It got spun up pretty good one day and broke the top rings as they hit the ridge. Nothing is rigid; everything flexes - a little. Especially engines.

You better be getting more than 28 hp... (even at the wheels).
_________________
'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST)

[airschooled]

[cdennisg]

[airschooled]

[telford dorr]

Good to see you finally got it installed. Isn't the counterweighted crank nice? You'll like it even better when doing those hours long runs turning 4000 r/m in the middle of nowhere, safe in the knowledge that you're not beating the center main bearing to death (because, even though we do it regularly, VW never intended a bus to be driven like that)...

Word to the wise: even though the engine really wants to do it, go easy on the 4400 r/m stuff until the valves have time to mate well with their guides. Oiling up there is what I consider marginal, and you don't want to have a valve stick. Should only take a few hundred miles or so.
_________________
'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST)

[Abscate]

ORcas In the Bay. Thats a killer shot to wail about.
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.ssS!

[TomWesty]

I lost a perfectly good night of sleep watching you assemble that beast, I hope it runs a long time.
_________________
If you haven't bled on them, you haven't worked on them.
Visit: www.tomcoryell.com and check out my music!

[airschooled]

Three weeks shy of one year since completing the long block, I took it to pick up donuts and VR1 this morning. The counter-balanced single port engine is a strange beast; the torque below 3,000 is crazy and the precision above 4,400 is music to my ears, that should cut at least seven minutes off my Pike's Peak time trial this Summer.

The zero-mile rings gave me a chance to drive like every other driver on the road these days, accelerating hard all the time… But instead of slamming on the brakes, I got hard off-throttle overrun with some unnecessary double clutch downshifting for more ring break in goodness.

Feels good to be back in the saddle, even if it was just a week off…

See you on the road,
Robbie

_________________
Learn how your vintage VW works. And why it doesn't!
One-on-one tech help for your Volkswagen:
www.airschooled.com

[Xevin]

[airschooled]