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  #11  
Old 6 Days Ago
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1324 = 81 cu. in. 130 hp would be 1.6 hp per cu. in. , not likely unless it can turn 8,000 + rpm.

Seeing the cases tells me it is an under-square engine so forget the 8 grand.

100 hp would be impressive from 81 cu. in.
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I was curious so I just went out and checked. The XR and XL rocker box bolt patterns are very different.

Quote:
Originally Posted by Ferrous Head View Post
It's possible he designed it to use XR rocker boxes. My engine came without rocker boxes. Stock Sportster ones will bolt on and I don't know if the bolt pattern for XR boxes are the same
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  #13  
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Just got this from a guy in the ZR forum section.

***************
Valve Angle, Intake: 33 Degrees
Valve Angle, Exhaust: 35 Degrees

68 degrees total (1977 XR750)
***************

And if the XR rocker box bolt patterns are different to the Sportster ones, well, I'll have to o some serious investigation. Sportster ones bolt straight on.
So, shorter rocker arms ? Doesn't make any sense.

Maybe he intended to so hid own rocker boxes but then why use Sportster bolt patterns ?

Yes, the HP number would be hard to get to. I used to run a big Honda that went 130 on the dyno and the rev limiter was normally set to 7500. For a big race we went to 8. The engine builder for that did tell me we could go to 8.5 in a "desperate" situation.

I only generally run my current engine to 6. But did push it "all the way" last year at the titles. I wasn't riding but I just told Bruce to "hold it wide open" until the end of the straight.

I don't have a rev limiter on it.

It's a testament to S&S and JE that these engines stay together at over 5000 FPM.

I would probably have to ask the Strociek to go to 5500 to get close to what I want.

I have no idea who made the pistons for Strociek.

I don't really want to test this engine to destruction but at the end of the day I believe it was built for racing. I think it would be a shame for it not to do what it was built for.
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  #14  
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The angle of the valve makes me think of something. The rocker boxes on my XL/XR project use ironhead rockers, which are essentially straight across (for lack of a more technical sounding description). The XR valve angle tells me that my "straight across" XL rockers aren't going to open the XR valves completely. Someone told me at the beginning of this project that I would have to cut and reweld the XL rockers at an angle. Now I understand why.

Also - regarding FH's rocker box bolt pattern query - four of the XR and XL bolt holes are close, but not close enough. An enterprising sort could weld and drill new holes.
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My thinking is the distance between the valve stem ends will be shorter with the smaller included valve angle. This would mean a lower rocker arm ratio as well.

I'm now thinking I need to find out if anyone else has Strociek parts to explain what he did. But then I don't know if all the heads he made were like mine. Certainly mine are different to the others I've seen so far.

Perhaps the design of the rocker boxes and shafts account for the XL cams installed ?

Different rocker arm ratios ?
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Abyone know if his name was Ivan or Dave ? I've seen both tossed around. Also refereces to him being Iranian.

Also, I think he's dead ? Or is he ?

Would be great to actually talk to someone who knows about this engine.
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Just went back and had a better look at these heads.

I will need to do a measure but they look like they may NOT be shallower !

This would explain the rocker boxes. And y the stock XLR valves appear to be a perfect fit.

I thought I had tried to install my Trock Travel checker on the heads some time ago and decided I couldn't use it because of the included valve angle.

If they are at 90 degrees it would make everything else a piece of cake.

I was thinking the better combustion chamber design would allow me to run petrol. That would have been a bonus. But in Period 4 I can still run Methanol so it should still make some usable power.

The Horner boys built a "Vincent" engine and went to Daytona.

Won the BOTT first time out.

My current stroker engine is quicker off the line than the Honda's. It's only 1076cc.

With 1324 I would have the acceleration on them, if not the legs.

Biggest problem is I originally planned to use this in a sidecar. Now I'm thinking of putting it into a solo. I will lose some of the advantage of the low down grunt.

But if the Horner boys can get past those ungodly fast Ducati's surely I can get past the Honda's.
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Quote:
Originally Posted by Ferrous Head View Post


The central plug location is a good idea but the plug electrodes not being in the chamber and with the flame initiated through that little hole seems to me to be less than ideal.

I once experimented with the "R" plugs that were used in the XLR. The ones where the spark happens up inside the plug. It was surprising how bad they made the engine run. At least on a street bike.

I wonder if this small detail could keep the engine from its full potential. There's not much room to lower the plug if you wanted to.

Anyone else with experience or thoughts on this?

I see that the aluminum XR has the plug pretty high in the chamber but it's not central. Obviously it works.


BTW I read an article about the early XR750 (1972) that described the valve angles like this:

"Included angle is 68° with the intake valve being 35° off the vertical." So I guess that makes the exhaust 33°
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Hi FE,

Extract from scale 1/1 OEM factory blueprint of XR 750 drg (9 feet by 3 feet...)

You can get the scaling by referring to the piston diameter, 76mm:



As far as I know, every XR rocker was had different angles between arms due to old K/KR cam spacing which is not aligned to the cylinder axis...

The factory had 2 forging dies, FRONT and REAR, and once stamped/machined, all the XR rockers were cut in the middle and rewelded in 4 different jigs to suit their final location.

Keep on the good work, FE, these Strociek heads and cyls are UNIQUE!!!

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  #20  
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I've had a better look at the Strociek parts and it;s good news and bad.

The bad news is that the chamber doesn't appear to be a modified hemi but in fact a full hemi.

I have had a look at a set of Strociek Shoel heads they look VERY mucj like my Sportster heads (except for ports being in the "normal" position. The description for the reads reads:

Quote:
Intake and Exhaust ports have been moved higher for improved flow. They are in a straight line into the combustion chamber at a 45 degree angle.
So, good news is that they may well flow better than stock IH's. But who knows ?

As I said it will make getting this thing up and running easier. Bing able to use stock components really will shorten the Development time.

As you can see from the pics I posted I already have a set of rocker boxes milled to match the engine (Just decorative and I didn't do it - they came to me that way) ad I have a set of Strocieks roller rockers to go in there.

And my Trock travel checker bolts straight on so I guess I can dial in whatever numbers I consider will work for me with this engine configuration.

I might even consider moving into the 21st century and using some software to help with cam selection.
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