Hi, I wish to tweak my GP150 iron barrel, firstly increasing bore size to 175cc and following this a guide for the porting;
http://drunkmunkey6969.googlepages.com/ ... nceporting
Can anyone offer more info or tips, experiences?
cheers
iron barrel enhancments
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How come phonetics isn't spelt with an 'f'?
Check out my boobs! <-- <--Just imagine being burried between those puppies!
Check out my boobs! <-- <--Just imagine being burried between those puppies!
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Wouldn't a Mugello 186 make more sense?red ghost wrote:Hi, I wish to tweak my GP150 iron barrel, firstly increasing bore size to 175cc and following this a guide for the porting;
http://drunkmunkey6969.googlepages.com/ ... nceporting
Can anyone offer more info or tips, experiences?
cheers
With the Iron cylinder you need to factor in the price of the rebore, piston, head machining and time involved grinding it out against a spanking new alloy kit...........
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Avantone wrote:Wouldn't a Mugello 186 make more sense?red ghost wrote:Hi, I wish to tweak my GP150 iron barrel, firstly increasing bore size to 175cc and following this a guide for the porting;
http://drunkmunkey6969.googlepages.com/ ... nceporting
Can anyone offer more info or tips, experiences?
cheers
With the Iron cylinder you need to factor in the price of the rebore, piston, head machining and time involved grinding it out against a spanking new alloy kit...........
I hear what you're saying, but I can do all the work myself, 10 yrs of engine reconditioning..
I will go for an alloy kit when the economy picks up,as I live in Australia the cost of shipping bites,hard
So at the mo I'm on a budget.
How come phonetics isn't spelt with an 'f'?
Check out my boobs! <-- <--Just imagine being burried between those puppies!
Check out my boobs! <-- <--Just imagine being burried between those puppies!
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I appreciate what you're saying.
It would be worth finding out the actual port timings to back up the measurements, but be aware the bottle-neck in this setup is the transfer port windows themselves (the timing and sizes are unchanged - the Mugello gives way more timed area).
Tony
It would be worth finding out the actual port timings to back up the measurements, but be aware the bottle-neck in this setup is the transfer port windows themselves (the timing and sizes are unchanged - the Mugello gives way more timed area).
Tony
I ran a MB stage 4 tuned 175 conversion in my GP150 - with a 30mm PHBH and clubman.
Nice rideable motor on the stock Italian gearbox & sprockets - decent performance gain in all areas over the 150.
I've got a port map somewhere I think - I could scan it and email it if you want?
Nice rideable motor on the stock Italian gearbox & sprockets - decent performance gain in all areas over the 150.
I've got a port map somewhere I think - I could scan it and email it if you want?
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i done 1 of these with a 62mm asso piston (2 thin rings) and the port timings i used were
180 degrees exhaust, 65% of the bore (about 40mm)
160 degrees inlet, as wide as the skirt would allow ( i broke into the manifold stud hole)
30mm phbh 130 main
55 pilot
40 slide
av 262 atomiser ( cant remember needle)
pm pipe
pacemaker box with 16/46 primaries
it went rather well
180 degrees exhaust, 65% of the bore (about 40mm)
160 degrees inlet, as wide as the skirt would allow ( i broke into the manifold stud hole)
30mm phbh 130 main
55 pilot
40 slide
av 262 atomiser ( cant remember needle)
pm pipe
pacemaker box with 16/46 primaries
it went rather well
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If you're looking for a Jap piston to go into a barrel, there's a guy called Brett south of Brisbane who has heaps of NOS pistons. He trades under the name of Retro-Moto (I think).
You might like to think about a 185 conversion (64mm) using a genuine TS185 piston.
I'm going to visit Brett when I come to Oz next year. He sounds like a top bloke.
You might like to think about a 185 conversion (64mm) using a genuine TS185 piston.
I'm going to visit Brett when I come to Oz next year. He sounds like a top bloke.
Martin
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Stokie wrote:I ran a MB stage 4 tuned 175 conversion in my GP150 - with a 30mm PHBH and clubman.
Nice rideable motor on the stock Italian gearbox & sprockets - decent performance gain in all areas over the 150.
I've got a port map somewhere I think - I could scan it and email it if you want?
if you can,that will help alot..
cheers
How come phonetics isn't spelt with an 'f'?
Check out my boobs! <-- <--Just imagine being burried between those puppies!
Check out my boobs! <-- <--Just imagine being burried between those puppies!
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Knowledge wrote:If you're looking for a Jap piston to go into a barrel, there's a guy called Brett south of Brisbane who has heaps of NOS pistons. He trades under the name of Retro-Moto (I think).
You might like to think about a 185 conversion (64mm) using a genuine TS185 piston.
I'm going to visit Brett when I come to Oz next year. He sounds like a top bloke.
Sounds like we should meet up for a beer..
How come phonetics isn't spelt with an 'f'?
Check out my boobs! <-- <--Just imagine being burried between those puppies!
Check out my boobs! <-- <--Just imagine being burried between those puppies!
Red ghost ,darren here from the lambretta club of south australia i have been tuning cast barrels ,ie , porting and jap conversions for over 20 years in oz ,185s ,230s and 240s ,if you need a hand with port timings , or porting work contact me ,on this site or paradise lost sc ,west australia,all of the info and how to do is available over here.