VW vs Lotus 7 on the track

That would be excelent, TomB.
The other aircooled accessory that I am sure there would be a market
for is a variable speed drive for the fan. This is so that over
3,000 rpm engine speed, the fan speed stays constant at the "3000
rpm" speed. If electronically controlled, the same system could be
used to provide extra cooling when engine heats up, and not rob
engine power when you really need it. I had imagined this could be
achieved with cones, springs and fly-weights. But my
electronics-savy friend tells me that these days it would be better
controlled with stepper motors inside the fan pully. Brian

TomB wrote:
>
> brian-in-nz wrote:
>>
>> For those who are interested.. the VW engine is std excpt for
>> ............ heavy duty valve springs (everyone should have
>> these) ...............
>>
>>
> Thanks for the link, sure looks like fun! (But I rather think HD
> valve springs are a liability for those of us who never go over
> 4,000 rpm. Un-needed loading causes more wear than necessary. Now if
> you go for a desmodromic valve design - cam opened and closed... no
> springs needed.)
>

Sean wrote:
>Tom that word isnt even in my dictionary ? LMAO
>
Sorry, my age is showing. Since spring-closed valves tend to "float"
when the spring isn't strong enough to close them at high rpm, and
since an engine wastes power opening valves against "heavy duty"
valve springs, engine builders tried the desmodromic design where
one cam opens the valve, and another pulls it closed. No spring
force (or very light) and positive valve closing, but very tight
tolerances and hard to adjust. The only production engine I know of
that used it was in the Ducati super sport motorcycles many years
back. Heck of a nice bike on winding roads. Back then they were a
tiny company that could still compete with the big Japanese racing
efforts. Now they've got more backing and are a powerhouse in
racing, but I don't know if they kept the desmo concept.

Brian, it must be said: Yeah Right!

Have you quit Opus and started working for the NZ Tourist Board?!

cheers, keep dry!

Gerard

brian-in-nz wrote:
>
> Actually, I see that Ducatti still sell new models of desmo bikes.
In
> formula one, pneumatic valve springs sort of took over in the
> eighties. I am surprised with all the interest in ultra-light valve
> gear now that someone isn't selling a pneumatic kit for the flat 4.
> In this system, there is a little light weight gas ram that shuts
> the valve instead of a spring. The weight of the ram is about 1/3 of
> the spring weight and the necessary gas pressure comes from a bottle
> of nitrogen.. or something like that.
>
> Sean.. you're not the first. Quite a few of my friends have
suggested
> I should turbo the 'Rat. It does make sense. However I thought that
> if I was to do that I should build a stronger bottom end first,
> eight dowel flywheel etc. Problem is.. it took me 7 years to build
> this car, and I know as soon as I start to change anything major,
> one thing will lead to another and it will be off the road again for
> another two years. And I like driving it now I've got it on the
> road. Everything is pretty much shoe-horned into the body shape. Not
> a lot of room for extra components, especially if they get really
> hot (turbo) and need to be kept away from the battery and fuel tank.
> The exhaust system was a problem to build, because with mid engine
> layout, it is hard to get all the pipes to the same point. I didn't
> want to go under the trany, as this reduces ground clearence and
> makes the pipes at risk of being ripped off by a rock or something
> (you should see our roads) and I couldn't go over the trany as the
> fuel tank sits there, so I had to take all the pipes to a collector
> accross the rear, just under the transmission nose. So.. For a
> turbo, I was wondering about mounting a small double entry turbo on
> each head, one for each head with no interconnection. But to do
> this, I have to mount them outside the car frame, in front of the
> rear wheels. It all gets too complicated. Better to start building a
> new car and keep this one as it is. So.. Ihave started building a
> new 2165 engine 78 crank and 94 pistons. 8:1 compression.. so I
> could still turbo it. I'm using a split duration cam from
> aircooled.net, chrome-molly flywheel, 044 heads, polished clearanced
> rods, chrome-molly pushrods, std rockers with "elephant foot'
> adjusters. I had evertything ballanced last month.. but I haven't
> yet started assembly yet. Weather is too good and I need to clean
> up the garage to make a nice clean engine assembly area before I
> start into it.
>
> The thing is.. under the NZ regulations, I can make these
> modifications and stay within the definition of the vehicle under
> the inspection certificate that it has which enabled it to be
> registered for road use. If I add a turbo, it's back to the
> certifier.. and That could be a lot of new problems I don't want to
> risk.
>
> Congratualtions if you have kept reading this far. And thanks....
> Brian
>
> TomB wrote:
>>
>> Sean wrote:
>>>Tom that word isnt even in my dictionary ? LMAO
>>>
>> Sorry, my age is showing. Since spring-closed valves tend to "float"
>> when the spring isn't strong enough to close them at high rpm, and
>> since an engine wastes power opening valves against "heavy duty"
>> valve springs, engine builders tried the desmodromic design where
>> one cam opens the valve, and another pulls it closed. No spring
>> force (or very light) and positive valve closing, but very tight
>> tolerances and hard to adjust. The only production engine I know of
>> that used it was in the Ducati super sport motorcycles many years
>> back. Heck of a nice bike on winding roads. Back then they were a
>> tiny company that could still compete with the big Japanese racing
>> efforts. Now they've got more backing and are a powerhouse in
>> racing, but I don't know if they kept the desmo concept.
>>
>
>

brian-in-nz wrote:
>
> Actually, I see that Ducatti still sell new models of desmo bikes.
In
> formula one, pneumatic valve springs sort of took over in the
> eighties. I am surprised with all the interest in ultra-light valve
> gear now that someone isn't selling a pneumatic kit for the flat 4.
> In this system, there is a little light weight gas ram that shuts
> the valve instead of a spring. The weight of the ram is about 1/3 of
> the spring weight and the necessary gas pressure comes from a bottle
> of nitrogen.. or something like that.
>
> Sean.. you're not the first. Quite a few of my friends have
suggested
> I should turbo the 'Rat. It does make sense. However I thought that
> if I was to do that I should build a stronger bottom end first,
> eight dowel flywheel etc. Problem is.. it took me 7 years to build
> this car, and I know as soon as I start to change anything major,
> one thing will lead to another and it will be off the road again for
> another two years. And I like driving it now I've got it on the
> road. Everything is pretty much shoe-horned into the body shape. Not
> a lot of room for extra components, especially if they get really
> hot (turbo) and need to be kept away from the battery and fuel tank.
> The exhaust system was a problem to build, because with mid engine
> layout, it is hard to get all the pipes to the same point. I didn't
> want to go under the trany, as this reduces ground clearence and
> makes the pipes at risk of being ripped off by a rock or something
> (you should see our roads) and I couldn't go over the trany as the
> fuel tank sits there, so I had to take all the pipes to a collector
> accross the rear, just under the transmission nose. So.. For a
> turbo, I was wondering about mounting a small double entry turbo on
> each head, one for each head with no interconnection. But to do
> this, I have to mount them outside the car frame, in front of the
> rear wheels. It all gets too complicated. Better to start building a
> new car and keep this one as it is. So.. Ihave started building a
> new 2165 engine 78 crank and 94 pistons. 8:1 compression.. so I
> could still turbo it. I'm using a split duration cam from
> aircooled.net, chrome-molly flywheel, 044 heads, polished clearanced
> rods, chrome-molly pushrods, std rockers with "elephant foot'
> adjusters. I had evertything ballanced last month.. but I haven't
> yet started assembly yet. Weather is too good and I need to clean
> up the garage to make a nice clean engine assembly area before I
> start into it.
>
> The thing is.. under the NZ regulations, I can make these
> modifications and stay within the definition of the vehicle under
> the inspection certificate that it has which enabled it to be
> registered for road use. If I add a turbo, it's back to the
> certifier.. and That could be a lot of new problems I don't want to
> risk.
>
> Congratualtions if you have kept reading this far. And thanks....
> Brian
>
> TomB wrote:
>>
>> Sean wrote:
>>>Tom that word isnt even in my dictionary ? LMAO
>>>
>> Sorry, my age is showing. Since spring-closed valves tend to "float"
>> when the spring isn't strong enough to close them at high rpm, and
>> since an engine wastes power opening valves against "heavy duty"
>> valve springs, engine builders tried the desmodromic design where
>> one cam opens the valve, and another pulls it closed. No spring
>> force (or very light) and positive valve closing, but very tight
>> tolerances and hard to adjust. The only production engine I know of
>> that used it was in the Ducati super sport motorcycles many years
>> back. Heck of a nice bike on winding roads. Back then they were a
>> tiny company that could still compete with the big Japanese racing
>> efforts. Now they've got more backing and are a powerhouse in
>> racing, but I don't know if they kept the desmo concept.
>>
> >>>>>>> FROM Sean ; Yeah i here that on gettin car,s registerd ?
Law,s on the book,s here dont make any sense at all ? From 74 ta
about the late 80,s ford, an Chevy , mopar didnt have there
proverbial poop together at all when it came too smogg control,s . I
lost a f-100 pick up i built in texas 429 police interceptor motor i
sett up in it for chasin badd cloud,s ? LMAO here they called the
smogg copp a mediator ? As in some one who mediate,s between you and
the Govt as in fair play and representation ??/ LMAO At the time i
had every thing in this truck ? Lived in badd apt complex . Caught 2
lil gang banger,s sittin on my tale gate ? Lett,s just say i whooped
there arses and that led too fore play with fire arm,s ? So all
that! took it too this mediator smogg copp after a 12 hr shift at
work . Was a industrial park building like 3 block,s from the
sherriff,s Dept ? Mediator asked me if the key,s were in it ? I was
tired said yeah . He dont even ask jump,s in my truck ? Fired it up.
I yelled hey ! point,s at a yellow line on ground , with a sign
sayin i have ta stand behind the line ? Truck died ? Cause he didnt
have elect fuel pump switch on ? I turned it on for him . Then he
pull,s it in the garage where i cant see it ? except for the back
end of my truck ? I see him walkin around with a screw driver?
Rappin my truck out ? Now it,s poppin back ? <<Can tell he played
with timming etc. I look around were only 2 there at the time and i
see what i beleive too be his ride ? << Mini GMC pick up new ?
<<Worse truck,s on road in america ? Come,s back with a list tell,s
me do all this too the truck it might pass ? But he isnt sure cause
of the interceptor camm and head,s ? 72 motor in a 75 pick up ? So
list was like 1500 buck,s of s--t ? I sold it for a boat motor and
parted the truck out . That was 11 year,s ago and it,s been on
atween me and the Govt of the Communist Republic of Californication
ever since . As for Govt ride molester ? <<< No Comment LMAO And i
dont buy part,s from junk yard,s that have any thing ta do with
ecology ? I hook luggy,s out window of big truck, when ever i see
sierra nevada club sticker,s ? I truly hate these people , with
every moral fiber of my body and soul ? And we call the Alqaieda
Extremist ? LMAO So in NZ they call these worm,s Certifier,s ? LMAO
Think i need more court orderd Angermanagement ? LMAO Guess only
thing too do is out smart um at there own game ? Lott,s of Ducatti
and Harley,s in this area I dont do Harley,s tryin ta shake the
badd boy sydrome ? Tom B where at in Texass are ya ? My wife is from
Abiliene area . Im related ta have the state so we might be Kin ?
LMAO Sean   
>