Jon H Posted February 9 Share Posted February 9 Does anyone have a busted ASP 70, 80 or 90 4 stroke cylinder head kicking around? If the exhaust port is ruined or something like that i would be interested in it for a little experiment. I dont want to mangle a good head if my experiment fails so if there is a busted one kicking around that isnt needed please let me know Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted February 9 Share Posted February 9 Hi Jon . Not sure if it still in the scrap box but replaced the heads on an OS 90 fs and an Alpha 72 . Both heads had busted exhaust monts. Ill look tommorow and get back . E.D. Quote Link to comment Share on other sites More sharing options...
Jon H Posted February 9 Author Share Posted February 9 Thanks ED, an os91 head would be perfect if you still have it Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted February 10 Share Posted February 10 Hi Jon. I found both the heads . They are just the heads with no valves etc , is that ok ? E.D Tha Alpha head has good exhaust but broken rocker mount and valve cover mount. PM me your address again and I can put in the post . Quote Link to comment Share on other sites More sharing options...
Jon H Posted February 10 Author Share Posted February 10 both sound perfectly fine for my experiment. can you please send them to me at laser? its easier as someone is always around to receive it. Do i owe you anything? Quote Link to comment Share on other sites More sharing options...
Kevin Fairgrieve Posted February 10 Share Posted February 10 (edited) 1 hour ago, Jon - Laser Engines said: Do i owe you anything? Yes you do!!! A full report once your experiment is complete, good or bad.🤣 Edited February 10 by Kevin Fairgrieve 1 Quote Link to comment Share on other sites More sharing options...
Jon H Posted February 10 Author Share Posted February 10 (edited) Ah yes well its a complicated attempt to save my SCASP 400 radial. One of its main issues is the valves. Some clown decided it would be fun to use valves made from cheese. And not a nice hard cheddar either, more of a baked camembert. In any case, the valves wear at an alarming rate and loose their seal after about 2 hours of running. I am bored of fixing them, so i thought 'would laser valves fit?' They do, the heads are not a bad size and they seal well, but the stems are too short for the existing valve guide and spring setup. So, what if i ream the heads and fit Laser valve guides, valves, springs etc...would it work? can i achieve the required accuracy? This is why i plan to experiment with a busted head before i mangle the ones on the engine. If i can fit the new valves, do i then need to make new rockers or can i shorten the rocker shaft mount post in the head? I also need to fix the rear crank bearing mounting plate as the bearing just falls out. I need to fix the front housing as the front bearing also just falls out, and....i forget, there is something else i need to do but cant remember what it is. Either way, there is much to do. EDIT. Wait, i remember. Make new piston rings and/or, see if i can make new liners and fit current Laser pistons and rings to increase capacity and performance. Edited February 10 by Jon - Laser Engines 2 Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted February 11 Share Posted February 11 Hi Jon no just pay postage to Macmillan charity or similar ? 1 Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted February 11 Share Posted February 11 Nice work Jon, a thread on it soon ?. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted February 12 Share Posted February 12 Hi Jon . Bits are on their way. Royal Mail second class Im affraid but shouldnt be too long. Quote Link to comment Share on other sites More sharing options...
Jon H Posted February 12 Author Share Posted February 12 On 11/02/2024 at 11:40, Paul De Tourtoulon said: Nice work Jon, a thread on it soon ?. Probably not soon. I have quite alot on my plate at the moment. 9 minutes ago, Engine Doctor said: Hi Jon . Bits are on their way. Royal Mail second class Im affraid but shouldnt be too long. No rush, and thanks for the help. 1 Quote Link to comment Share on other sites More sharing options...
Nigel R Posted February 12 Share Posted February 12 On 10/02/2024 at 21:24, Jon - Laser Engines said: Ah yes well its a complicated attempt to save my SCASP 400 radial. One of its main issues is the valves. Some clown decided it would be fun to use valves made from cheese. And not a nice hard cheddar either, more of a baked camembert. In any case, the valves wear at an alarming rate and loose their seal after about 2 hours of running. I am bored of fixing them, so i thought 'would laser valves fit?' They do, the heads are not a bad size and they seal well, but the stems are too short for the existing valve guide and spring setup. So, what if i ream the heads and fit Laser valve guides, valves, springs etc...would it work? can i achieve the required accuracy? This is why i plan to experiment with a busted head before i mangle the ones on the engine. If i can fit the new valves, do i then need to make new rockers or can i shorten the rocker shaft mount post in the head? I also need to fix the rear crank bearing mounting plate as the bearing just falls out. I need to fix the front housing as the front bearing also just falls out, and....i forget, there is something else i need to do but cant remember what it is. Either way, there is much to do. EDIT. Wait, i remember. Make new piston rings and/or, see if i can make new liners and fit current Laser pistons and rings to increase capacity and performance. Can't help but think the right answer is "5 Laser 80 cylinders fitted to the ASP crankcase which might as well be replaced because the valve gear is different which sort of gives you a five cylinder Laser"...? 😈 Quote Link to comment Share on other sites More sharing options...
Jon H Posted February 12 Author Share Posted February 12 Considered it, but it would put the carb and exhaust ports on the front of the engine and i also dont think i can get away with 'loosing' that many parts 😉 Quote Link to comment Share on other sites More sharing options...
mikem65d Posted February 14 Share Posted February 14 Wow Jon I have 2 ASP 70's and a 90 that are in a box with congealed castor that someone gave me to clean up. Then said to heck with them as they bought two Laser 70's over a year ago. too bad we're on the wrong side of the pond or else I's give them to you. regards Mike Quote Link to comment Share on other sites More sharing options...
Maurice Dyer Posted February 14 Share Posted February 14 Jon I have a defunct ASP. 65 head; i believe its the same size as a 70 ?. Any good to you let me know. Maury 1 Quote Link to comment Share on other sites More sharing options...
Jon H Posted February 14 Author Share Posted February 14 Thanks for the offers guys. ED's heads have landed, complete with an 8 legged friend who was determined to try and crawl all over me. I need to remove one head from the radial to check they are close enough in design for my experimentation and i will go from there. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted February 17 Share Posted February 17 On 14/02/2024 at 15:47, Jon - Laser Engines said: Thanks for the offers guys. ED's heads have landed, complete with an 8 legged friend who was determined to try and crawl all over me. I need to remove one head from the radial to check they are close enough in design for my experimentation and i will go from there. Ah a stow away 🙂 wel they had been in the scrap box for a few months . Check the ports for any hidden inflatable boats .🙂 2 Quote Link to comment Share on other sites More sharing options...
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