ESE's works engine tuner

[husaberg]

Sounds like you have the potential to make up to 9/10s in profit that could be ploughed into a better idea. Result.

Yeah I'd love to see that. Long winded and bad jokes? Right up my alley.

Unfortunately the article is not the one i thought
While I can envisage a way to alter the sluice gates controlled by a pressure control unit from a water pump (rob will know what i mean) but as Frits and Wob and the article (when i get around to posting it) say the steady state hp reading from a Watergate Dyno (although extremely accurate for its purpose) unfortunately doesn't correspond to anything a race engine is going to be asked to do on the track.

i think Dave is onto something there.........

[cookie1965]

While I can envisage a way to alter the sluice gates controlled by a pressure control unit from a water pump (rob will know what i mean) but as Frits and Wob and the article (when i get around to posting it) say the steady state hp reading from a Watergate Dyno (although extremely accurate for its purpose) unfortunately doesn't correspond to anything a race engine is going to be asked to do on the track.

i think Dave is onto something there.........

That's what I was thinking, at simplest either a variable speed pump or a servo control/worm gear on the sluice gate handle. The variable speed pump would be much simpler (since I have a shop full of pumps). But I wasn't sure if the sluice gates did more than control the flow, maybe they control the angle of the water entering the rotor? I'm going to pursue this a bit since I own the thing, figure out if I can make it work.

[Haufen]

Now you can express the radial characteristics of the transfer ports with positional and directional angles, regardless of bore and stroke.
And you can express the ports' axial characteristics with axial angles, but that only holds for engines with identical bore/stroke-ratios, as Wobbly explained.
Your approach of using a height h1 in the cylinder where the transfer port's roof would hit the opposite cylinder wall, is very good, but you need to express h1 as a percentage of the stroke. Then you will have a truly universal value. Then you will also see that short-stroke engines require smaller axial angles.

Your posts are always worth fiddling with the search function, Frits!

I've got a question regarding your post on scavenging angles with different bore/stroke ratios quoted above. Concerning the axial angles, what would you propose to do with them if the transfer port height (in percent of the stroke) is going to be reduced?

• Would you propose to keep the position where they would intersect with the middle of the bore thus increasing the angle?
• Or would you propose keeping the angle constant and thus reducing the scaled h1 by the same amount (in mm) as the transfers are going to be reduced?

[Frits Overmars]

I've got a question regarding your post on scavenging angles with different bore/stroke ratios quoted above. Concerning the axial angles, what would you propose to do with them if the transfer port height (in percent of the stroke) is going to be reduced?

• Would you propose to keep the position where they would intersect with the middle of the bore thus increasing the angle?
• Or would you propose keeping the angle constant and thus reducing the scaled h1 by the same amount (in mm) as the transfers are going to be reduced?

If you reduce transfer port height and thus transfer timing, there will be less time available to scavenge the cylinder at a given rpm. To compensate, you would need more vertical velocity in the scavenging colum which can be achieved by steepening the scavenging angles.
But less transfer timing will also mean less transfer time.area; this will lower the rpm of maximum cylinder filling, and the time available for scavenging will increase because of this lower rpm. All in all I think you should not steepen the scavenging angles.

[husaberg]

That's what I was thinking, at simplest either a variable speed pump or a servo control/worm gear on the sluice gate handle. The variable speed pump would be much simpler (since I have a shop full of pumps). But I wasn't sure if the sluice gates did more than control the flow, maybe they control the angle of the water entering the rotor? I'm going to pursue this a bit since I own the thing, figure out if I can make it work.

From what i understand (although i think there is a bit about a similar dyno on the elsberg tunning site)

Is the resistance for this dyno is controlled by the level of water.
No doubt there would be more sophisticated ones out there.
I definitely have seen something where someone converted a hydraulic dyno read out to work with a computer display rather than a manual strain gauge but where???
oh below the text version of the dyno article off the authors site, some different stuff there like injection etc.

[cookie1965]

From what i understand (although i think there is a bit about a similar dyno on the elsberg tunning site)

Is the resistance for this dyno is controlled by the level of water.
No doubt there would be more sophisticated ones out there.
I definitely have seen something where someone converted a hydraulic dyno read out to work with a computer display rather than a manual strain gauge but where???
oh below the text version of the dyno article off the authors site, some different stuff there like injection etc.

Converting to computer display is the easy part. Replace the spring/weight affair with a modern strain gauge and voila. I can buy a kit with everything needed. The hard part is automating the load controls so it can work right, as Frits and wobbly said. They're right about the fact that an inertia dyno would produce better data obviously too. It's been an interesting exercise and I've educated myself a whole bunch about dynos but I think I need to return to my original plan.

[husaberg]

For inspiration for Rob i have posted pics of the Porcupine AJS head before here is another variation plus a late Aircooled cylinder and head.


Note the spigoted head and the offset squish

[jasonu]

For inspiration for Rob i have posted pics of the Porcupine AJS head before here is another variation plus a late Aircooled cylinder and head.

Looks familar

[TZ350]

For inspiration for Rob.

Thanks Husa for the head ideas and here is a bit of Bucket Racing at the Island, now those guys are realy good.

[husaberg]

I see your island and raise you some additional Irish road racing bits as well.
Fooken mad they are aye Man.......

[chalkie]

have any of you guys any idea's on what sealant/grease would be good for heat transfer between a head insert & the head itself ?
I'm machining manually to the best of my ability but was worried about any small voids between the two.
thought probably copperslip might be ok,but guess that loctite or RS components might do something perfect.
any idea's appreciated !
cheers chalkie

[TZ350]

have any of you guys any idea's on what sealant/grease would be good for heat transfer between a head insert & the head itself ? RS components might do something perfect.

Heat Sink compund/paste sold for Computer CPU's would be my pick. The things to look for is the amount of silver in it (the more the bettor) and if it drys out.

Trademe

http://www.trademe.co.nz/computers/components/cooling-fans/thermal-compounds/auction-539878263.htm

http://www.trademe.co.nz/computers/c...-540371206.htm

[Grumph]

There's also a very similar paste which is used for bedding heating elements in press dies.
I last used it years ago - if it isn't the same stuff already posted, it'll be a higher temp version.

[wobbly]

Now thats what we are talking about

https://www.youtube.com/watch?v=fY6ZHiEWWhw

[wax]

That looks viscious . when its setup right its going to be awesome.

Whe ended up wining the 24 hour open class scooter race on the weekend. Scooter sat at 13500 rpm or close to it for 24 hours. I will pull it down in a few weeks and see what it looks like inside