HTV Boats
Well-Known Member
- Joined
- Nov 8, 2006
- Messages
- 2,512
A couple weeks ago I asked Mark Leyde (lights) which of his outboard conversion motors the 5 or 7 port were stronger. His honest answer was he didn't know so I offered to test them since we have open water and warm temps in south Florida. Well he took me up on it and sent me two powerheads (5&7 port) with headers. I have two pretty much identical Vision hulls with OS lowers and a pair of Irwin pipes to make a fair comparison. For props S&B GrimRacer 40X53's which we use for heat racing.
Motors are really a nice piece of work. Marks connversion & PTO are also top notch. Stock carbs are 8mm (.312). Will try some others but to start and compare I am using what came out of the box. Mark also shipped a couple Duratrax headers DTXC7598 which may not be the best but are availiable (Tower) and wanted identical for comparison. Headers are a bit long before the 90 degre turn and a had to leave enough to couple properly without a bad angle. At some point later I will adapt a different header bigger carb and a Cooper pipe.
Mount everything within an hour 4 bolts a throttle and pipe support and off to the pond. Set the carbs with a Mazor flow meter to what should be rich for a .21. Richened the low speed so it is not in affect. Threw the first boat in runs 30 ft and dies. Now I remember why I went to OS motors and hate mod 21's. Back on the table the pinch is just too tight so richen even more take the prop off and run two tanks of fuel through both motors. Both are still tight but now will run laps. A coule tanks later and starting to lean they both come on pipe and are very easy to throttle. One is now getting a good fit and starting to edge out the other. I won't at this point say which is the 5 or 7 port as till both are comletely broken in it would be unfair. This is just the first day. No bouys,stop watch or radar gun. Watching them run I was impressed and slowing down and cooling them off they came back on pipe easily. Not crisp yet but both ran well in a break in status. I feel both ran high 40's to low 50's and I would not hesitate to replace the OS we are running and doing well in Mod 21 right now. Mark wants us to race them so the will make Storm#1 and the WTChamps before we return them or maybe Mark will just be breaking in new motors for himself in Minnesota. For the $300 sumthing he's charging these are a deal for a od 21. Will they outrun a Drake or Primo Nova. Probably not but we'll soon see how they place in some of the best 21 tunnel fields anywhere.
Mike your Grimracer fuel did everything you said it would.
Mic
Motors are really a nice piece of work. Marks connversion & PTO are also top notch. Stock carbs are 8mm (.312). Will try some others but to start and compare I am using what came out of the box. Mark also shipped a couple Duratrax headers DTXC7598 which may not be the best but are availiable (Tower) and wanted identical for comparison. Headers are a bit long before the 90 degre turn and a had to leave enough to couple properly without a bad angle. At some point later I will adapt a different header bigger carb and a Cooper pipe.
Mount everything within an hour 4 bolts a throttle and pipe support and off to the pond. Set the carbs with a Mazor flow meter to what should be rich for a .21. Richened the low speed so it is not in affect. Threw the first boat in runs 30 ft and dies. Now I remember why I went to OS motors and hate mod 21's. Back on the table the pinch is just too tight so richen even more take the prop off and run two tanks of fuel through both motors. Both are still tight but now will run laps. A coule tanks later and starting to lean they both come on pipe and are very easy to throttle. One is now getting a good fit and starting to edge out the other. I won't at this point say which is the 5 or 7 port as till both are comletely broken in it would be unfair. This is just the first day. No bouys,stop watch or radar gun. Watching them run I was impressed and slowing down and cooling them off they came back on pipe easily. Not crisp yet but both ran well in a break in status. I feel both ran high 40's to low 50's and I would not hesitate to replace the OS we are running and doing well in Mod 21 right now. Mark wants us to race them so the will make Storm#1 and the WTChamps before we return them or maybe Mark will just be breaking in new motors for himself in Minnesota. For the $300 sumthing he's charging these are a deal for a od 21. Will they outrun a Drake or Primo Nova. Probably not but we'll soon see how they place in some of the best 21 tunnel fields anywhere.
Mike your Grimracer fuel did everything you said it would.
Mic
