Idle musing

[SprintV8]

Only just seen this post.<br>
<br>
Why would you need the camshaft rotating the other way?.<br>
<br>
I did look into the 32v Stag engine at some lenght and still can not find any reference to it.(Net Picture's ETC.)<br>
<br>
The timing chain duplex mod was carried out by a bloke called Nathan there is a link to it on the Stag net which I will find and repost here.<br>
<br>
Some picture's of the Engine and a Timing cover being modified.<br>
<br>
Iam still think of doing this (32v Big Lottery win 1st)and the duplex set up and have all the duplex chains to hand so to speak.

<p>1980 Dolomite Sprint V8 (Sprint's where never meant to sound this good?)<br>
1997 Vauxhall Calibra 2.0 16v SE8<br>
2003 Suzuki GSX1300R (The Yamaha R1 is indicating 190mph When the Busa flies past)<br>
This space is available for advertising, contact user for rates.</p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... printV8</A> at: 27/9/05 6:54 am<br></i>

[LewisK]

Exactly what I was thinking, Hell, if it wasn't going to work with Sprint heads...<br>
<br>
How the hell did it work with the 8 valvers <!--EZCODE EMOTICON START :D --><img src=http://www.ezboard.com/intl/aenglish/im ... /happy.gif ALT=":D"><!--EZCODE EMOTICON END--> Seeing as that nothing's actually changed as regards to driving the cams....

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[Jon Tilson]

Aero engine technology of the ww2 era has almost all made its way in to car engines...with one exception.<br>
The sleeve valve...<br>
Given that the so valved Bristol Centaurus rivalled the Rolls Griffin and Napier Sabre for the top UK aero piston I wonder why the sleeve valve has never been considered? The Griffon is IIRC a sohc 4 valve per cylinder V12 with finger rockers and chain drive....eat your heart out you Italians...and varioulsy turboed and supercharged as well.<br>
Interesting thread...<br>
Jonners

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[davepoth]

Doesn't the sleeve valve burn lots of oil?

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[alun n]

The cams on the 8 valve per head V8 engine can turn in the same direction as each other as the cam operates the valve directly for both exhaust and inlet so the cam on the mirror head just needs to be correctly 'timed in'. The 16v heads however rely on rockers to operate one bank of valves remotely; as one head is the mirror of the other and inlets will always be uppermost the cam and its rotation also need to be mirrored as you would be unable to correctly 'time in' the mirror cam...I think...<!--EZCODE EMOTICON START :| --><img src=http://www.ezboard.com/intl/aenglish/im ... ferent.gif ALT=":|"><!--EZCODE EMOTICON END--> <br>
<br>
Get casting Phil!<br>
<br>
Surely Lewis and Mart could model a working mirror head between them in their lunch hour?

<p>1973 Dolomite Sprint<br>
1974 Dolomite Sprint<br>
1977 Dolomite Sprint (Pageant)<br>
1977 Dolomite Sprint (White)<br>
1979 Dolomite Sprint<br>
1979 Dolomite 1850HL<br>
1980 Dolomite 1500HL<br>
1998 Lotus Elise<br>
1999 Alfa Romeo 166 2.5 V6<br>
1999 Alfa Romeo 166 3.0 V6 (Didn't sell, still for sale!)</p><i></i>

[dollysteve]

Jonners, the sleeve valve engine did find it`s way in to a car, indeed my work colleague who runs a small wedding car hire firm has one, it`s a Daimler, not sure of model but I will find out.<br>
Check this site out: <!--EZCODE LINK START--><a href="http://www.daimler.co.uk/history/html/sleevevalve.htm" target="top">Sleeve Valve</a><!--EZCODE LINK END-->

<p>1976 Dolomite was a 1500<br>
1976 Dolomite 1850 HL Auto<br>
1979 Dolomite 1850 HL Man o/d<br>
1989 Noisy Mini 1340 <br>
1998 Fiat Bravo TD 100 again (For sale soon)<br>
1968 1300 FWD</p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... lysteve</A> at: 27/9/05 2:27 pm<br></i>

[davepoth]

Will the sprint cam actuate the valves properly (although in the wrong order) if it's run backwards?<br>
<br>
-edit-<br>
<br>
Answered my own question with a no. If you run the cam backwards, you'll end up with the exhaust valves opening first, then the inlet valves after that.<br>
<br>
However, what about casting the mirror head so that the rockers act on the inlet valves instead of the exhaust valves? I know it would be a big redesign, but it would be an elegant solution.

<p></p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... avepoth</A> at: 27/9/05 3:04 pm<br></i>

[LewisK]

Alias is running...got any Diagrams of the Sprint head? <!--EZCODE EMOTICON START 8o --><img src=http://www.ezboard.com/intl/aenglish/im ... s/nerd.gif ALT="8o"><!--EZCODE EMOTICON END-->

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[davepoth]

<!--EZCODE IMAGE START--><img src="http://www.motorbase.com/uploads/2003/1 ... t_head.jpg" style="border:0;"/><!--EZCODE IMAGE END--><br>
<br>
This do for starters?<br>
<br>


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[LewisK]

cheers, that'll get it going!

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[SprintV8]

If you run the cam backwards, you'll end up with the exhaust valves opening first, then the inlet valves after that.<br>
<br>
<!--EZCODE BOLD START--><strong>Easy way get a new cam made so it opens the valve's the way you what.</strong><!--EZCODE BOLD END-->

<p>1980 Dolomite Sprint V8 (Sprint's where never meant to sound this good?)<br>
1997 Vauxhall Calibra 2.0 16v SE8<br>
2003 Suzuki GSX1300R (The Yamaha R1 is indicating 190mph When the Busa flies past)<br>
This space is available for advertising, contact user for rates.</p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... printV8</A> at: 27/9/05 9:00 pm<br></i>

[tinweevil]

Started writing this this morning so forgive me for the bits I'm repeating others on.<br>
<br>
Why the wrong way? I'll have a go at explaining. (Some animated 3D would explain it a lot better thos eh Lewis?). I'll make it simplistic because a) it's easier and b) my knowledge isn't good enough to be 100% accurate.<br>
<br>
Each lobe on the cam operates two valves one inlet direct and one exhaust via a rocker. It operates these two valves during half a rotation since the cam rotates at half the speed of the crank. This corresponds to the exhaust and inlet strokes of the piston. During the compression and ignition strokes all valves are shut. <br>
<br>
So we have four significant phases for the cam, same as the strokes of the piston and each approximately equal. And... Oh sod it I'll have to draw a picture!<br>
<br>
<!--EZCODE IMAGE START--><img src="http://www.tinweevil.plus.com/images/32valves.jpg" style="border:0;"/><!--EZCODE IMAGE END--><br>
<br>
Exhaust opening before inlet is the correct sequence. In the above the cam on the green (existing) side runs clockwise. Running the cam backwards on the mirror head will achieve the correct sequence in a cylinder but you're not out of the woods yet. I think what follows is what Alun was on to?<br>
<br>
The cams for each cylinder point at different directions, there is always one cylinder in a 4 pot in each phase. Putting a sprint cam in the left head would probably have the cams oncorrectly timed with respect to the crank, you could have inlet valves open on up strokes. You can change the orientation of the cam with respect to the crank to get some pots working but you can't change the orientation of the lobes pot to pot. But it's worse even than that. It may well be that even on the right head the cam is incorrectly timed to the crank because you'd be using a sprint cam with stag crank. On the sprint pots 2 and 3 rise and fall together, is it the same on a stag? If the centre two pots rise and fall together on both banks on the stag (not all 4 together, 2 groups of 2) then there is a chance that standard cams can be used. Even if it does I'll still not be certain. Otherwise it'll be one or two custom cams.<br>
<br>
And we still havn't got over the problem of how to make the cam in the left head run backwards. Even a custom cam can't fix that.

<p>1978 <!--EZCODE LINK START--><a href="http://www.triumphowners.com/704">Dolomite Sprint</a><!--EZCODE LINK END--><br>
1968 <!--EZCODE LINK START--><a href="http://www.triumphowners.com/705">GT6 II</a><!--EZCODE LINK END--><br>
1972 Spitfire IV<br>
39 anorak points on the Nicholas scale<br>
</p><i></i>

[SprintV8]

He has a point looking at the Picture,<br>
<br>
Thinking CAPS on.

<p>1980 Dolomite Sprint V8 (Sprint's where never meant to sound this good?)<br>
1997 Vauxhall Calibra 2.0 16v SE8<br>
2003 Suzuki GSX1300R (The Yamaha R1 is indicating 190mph When the Busa flies past)<br>
This space is available for advertising, contact user for rates.</p><i></i>

[SprintV8]

Right hand chain drive.<br>
<br>
Use a shorter chain to drive a pulley located just under the camshaft driven by the crankshaft by chain as per normal.<br>
That pulley will have a machined gear to macth a new gear located on the camshaft meshed together it will rotate BACKWARD'S.<br>
<br>
Sorry Havn't got a clue how to post drawing's<br>
<br>


<p>1980 Dolomite Sprint V8 (Sprint's where never meant to sound this good?)<br>
1997 Vauxhall Calibra 2.0 16v SE8<br>
2003 Suzuki GSX1300R (The Yamaha R1 is indicating 190mph When the Busa flies past)<br>
This space is available for advertising, contact user for rates.</p><i></i>

[davepoth]

Phil, <br>
<br>
If you have a picture I can host it...<br>


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