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Location:
brisbane
Registered:
October 2004
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Location:
Sydney
Registered:
June 2004
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Re: 2tg hyrid - 4y crank, 2150cc?
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Mon, 17 January 2005 01:42
 
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if memory serves me right the 2T can be bored out to a 2L or even 2.2L but you are not leaving any room between the cylinder and the water jackets
thats the main thing that needs to be considered!!! you dont want only a couple mm between them otherwise the head gasket will continually blow... even using a metal head gasket wouldnt be that much different as there is very little room to seal
as for crank you could still use the 2T/3T crank but would require pistons to the size of the over bore
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Location:
brisbane
Registered:
October 2004
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Re: 2tg hyrid - 4y crank, 2150cc?
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Mon, 17 January 2005 02:24
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ah thanx for that info, i didnt know it would such
a major factor in it. so say a 4y crank with a mild bore
job would give a capacity of 2150 + 150 = 2300cc, how
does that sound?
i have a hybrid at the moment and its basically a 2000cc,
it has 3t crank and oversize pistons, no probs with head
gasket so i assume the overbore of about 200cc was fine.
what parts and mods do i need to do to use a 4y crank?
is it recommended, anyone have one?
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Location:
Castle Hill, Sydney
Registered:
February 2004
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Re: 2tg hyrid - 4y crank, 2150cc?
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Mon, 17 January 2005 07:49
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i cant imagine you being able to increase the stroke by much more at all?
the pistons are close enough to hitting the valves as it is!
you definately wouldnt be able to stroke it out any further without custom made forged pistons! $$$$$$$$$$
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Toymods Vice President
Location:
Sydney
Registered:
May 2002
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Re: 2tg hyrid - 4y crank, 2150cc?
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Mon, 17 January 2005 08:00
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| fade-e wrote on Mon, 17 January 2005 12:42 |
if memory serves me right the 2T can be bored out to a 2L or even 2.2L but you are not leaving any room between the cylinder and the water jackets
thats the main thing that needs to be considered!!! you dont want only a couple mm between them otherwise the head gasket will continually blow... even using a metal head gasket wouldnt be that much different as there is very little room to seal
as for crank you could still use the 2T/3T crank but would require pistons to the size of the over bore
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I think if you bore the 3T block for big enough pistons to make it a 2.2 on the standard stroke, head gasket sealing would be the least of your problems. The bores would be right through to the water jackets.
The "Internet wisdom" on how much a 3T block can be bored out is 89mm, the more informed tend to keep it down to a maximum of 88.5 due to too thin a bore wall.
The guys at Toysports talk about using the 4Y crank to stroke the T series out to 2150cc. http://www.toysport.com/Technical%20Information/2t g_18rg_3tg_tech_notes.htm
Yes obviously you are going to have to reduce the compression height either through the use of customer pistons with a higher pin location or shorter con-rods. I really wouldn't like to contemplate the latter though.
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Location:
brisbane
Registered:
October 2004
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Re: 2tg hyrid - 4y crank, 2150cc?
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Mon, 17 January 2005 10:27
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ah yes... compression. maybe custom made metal gasket would work to lower compresssion but is not the best and probably prone to blowing out and expensive i assume.
the 4y crank fits with some modification but they dont say
what has to be done. probably not a great deal. iv read most
of that site, its awesome!
yes and a 3t crank has a tight enough clearance as it is
lol, so a 4y would have to have pins higher up or shorter conrods$$$, i wonnder what the 4y pistons are like hmmm
or if any pistons would work.
it seems the 4y crank stroke the 1.8L 3t and the later model
1.6L 2tg to 2150cc?? with no boring out is this correct?
so 4y of 2150cc and overbore to 88.5 = 2300cc?
well its recommended not to make the 2tg more than 2L
capacity for strength, balance and smooth operation so
maybe ill stick with my 2L hyrid then.
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Re: 2tg hyrid - 4y crank, 2150cc?
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Mon, 17 January 2005 16:57
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Yeah they also say that how the conrod connects to the crank isn't all that good either for the mod. But i sent them an email a couple of year back asking them about what needs doing to fit the crank and from memory its the front of the crank that needs to be machined down in size.
But yeah its got me interested in it still especially the line "No officer its only a 1.6" 
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Toymods Vice President
Location:
Sydney
Registered:
May 2002
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Re: 2tg hyrid - 4y crank, 2150cc?
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Mon, 17 January 2005 23:49
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| styler wrote on Mon, 17 January 2005 21:27 |
it seems the 4y crank stroke the 1.8L 3t and the later model
1.6L 2tg to 2150cc?? with no boring out is this correct?
so 4y of 2150cc and overbore to 88.5 = 2300cc?
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I believe the 2150 quoted was with 89mm pistons. I can't say I'd expect a very long life with the kind of side loads on the bores that suc a long stroke crank would have, especially when the bores would be paper thin already.
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Re: 2tg hyrid - 4y crank, 2150cc?
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Tue, 18 January 2005 18:06
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By using the 4y crank or even the 3y crank will bring the capacity out to 1952cc. Thats with standard 85mm pistons.
Using 88.5mm pistons (18r) brings the capacity to 2116cc
89mm pistons = 2188cc
91mm pistons (4y) = 2237cc Which pretty well much what the 4y is.
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Location:
brisbane
Registered:
October 2004
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Re: 2tg hyrid - 4y crank, 2150cc?
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Wed, 19 January 2005 14:08
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thanx too all for all the info, much appreciated
i think ill rebuild the 2L 2tg hyrid cheers
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Location:
Finland
Registered:
June 2004
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Location:
brisbane
Registered:
October 2004
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Re: 2tg hyrid - 4y crank, 2150cc?
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Thu, 20 January 2005 09:45
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 wow
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2300cc "5T"-engine 
