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slyck(at)frontiernet.net
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NeilsenRM(at)comcast.net
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 Posted: Wed Oct 10, 2007 7:01 am Post subject: redrive |
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Bob
Thanks. The redrive looks good. Allot of questions come to mind. How much is
it? How much does it weigh? Who well made is it? Does the redrive allow for
up or down mounting? How effective is the harmonic dampener? Is it
supported.
I have too much time invested it the setup I have, it is light weight and
runs smooth. I'm happy with what I have. Anyone else what to run with this
one?
Some thoughts:
Weight is a problem with VWs you have to be very carful to keep the engine
light. This geared redrive looks like it would add 23-25 or more lbs to the
engine. The other geared redrive that some people talk about for Geos and
VWs adds about that much weight. If the redrive is able to be mounted in the
down the position the VW engine could be mounted on the stock Kolb mount
with a adapter but the adapter for my direct drive VW added 5-8 lbs. The
current Kolb VW mount wouldn't work with this redrive without a minor
change. The mounting lugs for the bed type mount aren't spaced the same on
the front and back of the engine. This redrive mounts the redrive on the
flywheel end of the engine so the engine would need to mounted with the fly
wheel end towards the back.
The harmonic issues with my cog belt drive caused vibration cracking on
exhaust, air cleaners and caused bolts to work loose. I know Gene Smith
tried a number of harmonic dampeners on their cog belt drives and even tried
a sparg clutch without much success. Even the 912 guys have exhaust system
cracking due to engine prop harmonics. The one way slipping serpentine belt
drive I have now is very smooth. Will these redrives be as smooth? I have in
effect been the test pilot for composite props and Kolbs for the Valley
redrive. Who wants to test pilot these.
I'm not trying to scare you off from these redrives. I just want people to
try these drive with your eyes open to the potential issues.
Rick Neilsen
Redrive VW powered MKIIC
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Wed Oct 10, 2007 7:26 am Post subject: redrive |
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Even the 912 guys have exhaust system
| Quote: | cracking due to engine prop harmonics.
Rick Neilsen
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Rick:
I'm getting ready to load up and head West with my dirt bike and 5th wheel,
but will take a minute to reply to this statement first.
How did you determine we are having problems with 912 exhaust systems due to
"engine/prop harmonics"?
The STE system that I am using has a design problem of hard mounting
attachment tabs to the each cyl head.
There was a run of Titan exhaust systems that ran with improper outlet
material. Stubs were not Rotax and not stout enough to handle the job.
Not aware of any engine/prop harmonics. The torsional vibration system,
that includes a slip clutch, does a great job keeping the 912
smooth..............
I plan on riding in NM, CO, UT, NV, AZ, CA, and if it ain't too cold, head
up to the Rock House in SE corner of OR. Larry and Karen Cottrell hunt the
hawk and falcon this month. I would love to be able to observe that, plus
he and Karen are a hoot to hang out with and has a great area to ride the
dirt bike. If you all want to have a cup of coffee, when I am in your area,
send me a bc msg. I'd like to hook up some names and faces from the Kolb
List.
Take care,
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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herbgh
Joined: 10 Jan 2006
Posts: 145
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jindoguy(at)gmail.com
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| Posted: Wed Oct 10, 2007 10:12 am Post subject: redrive |
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Running a new redrive can be such fun. I had a Ross on a Mazda 13B that needed so many modifications to fix it I eventually dumped the whole project. Little things like .38 end play on the input shaft (not a misprint, 3/8"), can be a real pain to correct.
These guys have a slow website and I got tired of waiting, but another question to add is how is it lubricated. Some run the engine oil for the gearbox. Doubtful, but better to know before the box arrives.
On the other hand, the Czechs and Poles have very high standards for metal work, if the dollar stops tanking, this could be real nice.
Rick
On 10/10/07, herbgh(at)juno.com (herbgh(at)juno.com) <herbgh(at)juno.com (herbgh(at)juno.com)> wrote: [quote]--> Kolb-List message posted by: herbgh(at)juno.com (herbgh(at)juno.com)
Richard
Do not think it gets more elegant and therefore simple than the redrive
you have on your engine.. Wondering how many hours you have on it by
now? Herb
ps what is the brand and pn of the belts? 
On Wed, 10 Oct 2007 10:56:36 -0400 "Richard & Martha Neilsen"
<NeilsenRM(at)comcast.net (NeilsenRM(at)comcast.net)> writes:
[quote] --> Kolb-List message posted by: "Richard & Martha Neilsen"
<NeilsenRM(at)comcast.net (NeilsenRM(at)comcast.net)>
Bob
Thanks. The redrive looks good. Allot of questions come to mind. How
much is
it? How much does it weigh? Who well made is it? Does the redrive
allow for
up or down mounting? How effective is the harmonic dampener? Is it
supported.
I have too much time invested it the setup I have, it is light
weight and
runs smooth. I'm happy with what I have. Anyone else what to run [quote][b]
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NeilsenRM(at)comcast.net
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| Posted: Wed Oct 10, 2007 12:48 pm Post subject: redrive |
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Herb & Vince
I don't know the make and part number of the belts. I just looked and it has
warn off. This is the same redrive they put on their big twin just a bit
larger. My drive is a preproduction model. There is a wear indicator on the
redrive their instructions were to replace the belts after the redrive has
traversed the wear indicator twice. Their prototype drive went 100 hours on
the belts and are still in good shape. I have 25 hours on my redrive and
can't see any wear but I do see belt dust on the engine case. My belts were
used belts because they got the drive to me just before Oshkosh and they
didn't want me having to adjust the belts on my trip. I understand new belts
need a few adjustments in the first hour of wear in. The wear indicator on
my belts hasn't moved since I installed the drive. I don't know what the
cost of replacement belts will be.
I don't know of any maintenance other than the belts. There are six silicone
balls that act as the spring for the tensioning arm that might need
replacement some time but they think they are good for ever. They do
recommend run up testing from time to time to make sure the belts aren't
slipping but that's about it.
In preflight I check the wear indicator. Knowing how the drive works I
figure that If you miss the movement on the wear indicator you might see
some slippage on takeoff under full power in the form of higher than normal
RPMs. Throttling back to normal RPMs should keep you climbing but at a
somewhat reduced rate. They tell me properly adjusted one of the two belts
will drive the prop.
I get no money from Valley and I purchased the first redrive. The upgrade to
the new redrive and all the other reduction ratios they sent me on the old
redrive were all free. All I had to pay is return shipping.
They sent me a E-mail a week ago that they were going to send me a two
bladed wood 74" prop to try. They say it is free unless I keep it.
Rick Neilsen
Redrive VW powered MKIIC
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