Hogslayer details anyone?

fiatfan · Jan 23, 2016

Stumbled upon some short film clips on the tube with T.C. Christensen and the Hogslayer. Thought it was very interesting and would like some more details concerning the inside of these motors, I´m just curious, that´s all. Have found some facts, seems to be 810cc converted 750:s, FI, slip clutch and more, now please excuse my language, but how the hell did they stop the cylinders from taking off :shock: ? From the pics and film clips I´ve seen, there seems to be standard base studs, nothing special. And these motors produced 150+ BHP each! That´s one hundred and fifty! EACH! I´ve searched around the net quite a bit, but I haven´t found much detailed info on the inner bits, would be really interesting to see some pics and reading more about this.
Tommy

snail · Jan 23, 2016

I'd also be rather keen.....

Paddy_SP · Jan 23, 2016

fiatfan said:
Stumbled upon some short film clips on the tube with T.C. Christensen and the Hogslayer. Thought it was very interesting and would like some more details concerning the inside of these motors, I´m just curious, that´s all. Have found some facts, seems to be 810cc converted 750:s, FI, slip clutch and more, now please excuse my language, but how the hell did they stop the cylinders from taking off :shock: ? From the pics and film clips I´ve seen, there seems to be standard base studs, nothing special. And these motors produced 150+ BHP each! That´s one hundred and fifty! EACH! I´ve searched around the net quite a bit, but I haven´t found much detailed info on the inner bits, would be really interesting to see some pics and reading more about this.
Tommy

Good call!

Keith1069 · Jan 23, 2016

I have the Tee shirt but never bought the video. Dont know if its still available as the site is dead bud the producer may still have copies (edgeltd@charter.net) and there may be more info in there? Whether its enough to satisfy I dont know. He did eventually go to 850 cases and barrels but its amazing how it stayed togrther on nitro. 150 Hp each motor? Saw him run in the UK back in 72? and last year the bike was on display at a Nostalgia drag meet I went to. I missed seeing it though :x

Chris · Jan 23, 2016

I believe that a search on this site will give you lots of info.
Also Hobot

may make a reappearance cos he does know a bit about Terrys bikes.

This is a nice link but there are plenty more.
topic-t12069.html

Chris

Danno · Jan 23, 2016

I'm sure there were forged pistons and steel rods in there, titanium being only in Russian submarine hulls at the time. I would also assume special (one-piece?) cranks, strengthened cases, and steel thread inserts to hold the barrels down.

Camped next to those guys at a National Rally in Ohio years ago. Party!

Bernhard · Jan 23, 2016

Fuel injectors by a driven Hillborn pump from the end of the camshaft, 95 % yes, 95% nitro methane......................
anyone want to make a copy :?:

fiatfan · Jan 23, 2016

Thanks for the link Chris. Danno, sorry to disappoint you, but I read through the article in the link, had to write out a piece of it since it wasn´t possible to copy;

"Both engines are so close to stock that it´s hard to believe. Bore and stroke remain stock, with the addition of 10.0 to 1 pistons for a boost in the compression department. The flywheel have been shaved off 4 pounds, but only to compensate for the added weight of the extra gears needed to connect the engines together. The two engines are connected by a double row primary chain with an idler gear to utilized to take up the slack. They also receive lubrication for each pass by – what else? – the stock chain oiler!
The cams are over the counter items ground by Sunset Motors, and the valves are stock."

I just say pretty impressive, who knew these motors could take that amount of power.... :shock:
Tommy

fiatfan · Jan 23, 2016

I also read somewhere that Sunset Motors was planning a twin Norton with the engines side by side :shock: when the Norton factory closed down, think they had quite a bit of support from there. That would have been something to see! One just hope that they weren´t going to run them as a parallel straight 4, don´t think even the isolastics would have taken out those shakes... :mrgreen:
Tommy

grandpaul · Jan 23, 2016

150 HP each?

Sounds impossible.

pete.v · Jan 23, 2016

grandpaul said:
150 HP each?

Sounds impossible.

A lot of it is how nitro responds in a hemispherical engines. It's almost a doubler. It is sort of a phenomena. Harleys respond to Nitro kinda the same way, mysteriously effective.

triumph2 · Jan 23, 2016

Danno said:
I'm sure there were forged pistons and steel rods in there, titanium being only in Russian submarine hulls at the time. I would also assume special (one-piece?) cranks, strengthened cases, and steel thread inserts to hold the barrels down.

Camped next to those guys at a National Rally in Ohio years ago. Party!

I remember that rally well

When I asked TC if I could have my pic taken on the Hogslayer he grinned and said," You won't try to start it will you?"

Hortons Norton · Jan 23, 2016

Don't know if anyone would like to check this site for info;

http://www.choppertown.com/hogslayer-fu ... -download/

Hortons Norton · Jan 23, 2016

Or I can bring mine to the Feather River Rally in July?

But you would have to ride to the Sierra's to see it. :wink:

lcrken · Jan 23, 2016

As I recall, from magazine articles back in the day, the original engines were 750 Atlas, not Commando, and were pretty much stock bottom ends (cases, crank, and rods). The later versions of the bike had Commando cases, and I don't recall any of the details of them. You have to remember, they only had to run under load for 8 seconds at a time. If you haven't seen it, I recommend buying the video. Lots of info in it.

Ken

bill · Jan 23, 2016

back in 73 I had a long chat with john gregory and one topic that he brought up was the 810 kit I had on my bike. I told him about the head gasket issues and head bolts also. I later seen where when they gave them a try they heliarc'd the jug from the top down to below the 3rd fin in an attempt to keep it in one piece. not long after that he went to the 850 based motors.

ashman · Jan 23, 2016

I have the DVD and the most impressive thing they had over 160 meets without rebuilding the motors, their clutch design and built by them is still being used today and the best thing is they run Joe Hunt maggies, I just love my Joe hunt, also they got a lot of surport from everyday poeple they also love to party with their surporters, I lent my DVD to so many mate who never really understood my liking of Nortons and now they understand why.

Ashley

o0norton0o · Jan 23, 2016

I have an old biker magazine with an article on the hogslayer in it... I guess, I'll have to look and see if there's anything in it worth scanning and posting. stay tuned...

WZ507 · Jan 23, 2016

Danno said:
I'm sure there were forged pistons and steel rods in there, titanium being only in Russian submarine hulls at the time. I would also assume special (one-piece?) cranks, strengthened cases, and steel thread inserts to hold the barrels down.

Camped next to those guys at a National Rally in Ohio years ago. Party!

Probably aluminum rods (stock?) as they are the commonly employed connecting rod in nitro engines.

o0norton0o · Jan 23, 2016

I found the article. It's in an old "Iron horse" 1989 yearbook edition. The three 1975 commando engines are listed as stock, as are all the internal components, pistons, rods, tappets, valves, cases, etc. The displacement is listed as 2500cc. The carbs are 6 hillborn fuel injectors. The article says it weighs 850lbs and does a quarter mile in 8 seconds with a top speed of 185mph. The article also says DT has no idea how much horsepower it makes.

The article has a couple of pictures that I could scan if someone really wants to see them. I don't know how good they will come out... also, I wonder if it's a copyright infringement to post pictures from an old magazine article...??

Hogslayer details anyone?

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