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Re: T5 aly with a 152 polini conversion.
Posted: Thu Jun 26, 2014 8:09 am
by mick1
I notice you've left the crank, seals and bearings (unprotected) in place when you worked on the casings
. Are you just cleaning the casings with all parts intact or will you be removing/replacing ?
Re: T5 aly with a 152 polini conversion.
Posted: Thu Jun 26, 2014 8:43 am
by fastfrog
mick1 wrote:I notice you've left the crank, seals and bearings (unprotected) in place when you worked on the casings
. Are you just cleaning the casings with all parts intact or will you be removing/replacing ?
all bearings/seals will be replaced. You probably noticed that the previous owner fitted the clutch seal the wrong way....
Re: T5 aly with a 152 polini conversion.
Posted: Thu Jun 26, 2014 6:15 pm
by Jack221
Nice porting job fastfrog! What transfer and exhaust durations with the 2mm packer? And squish clearance and compression?
Re: T5 aly with a 152 polini conversion.
Posted: Thu Jun 26, 2014 6:51 pm
by mick1
fastfrog wrote:mick1 wrote:I notice you've left the crank, seals and bearings (unprotected) in place when you worked on the casings
. Are you just cleaning the casings with all parts intact or will you be removing/replacing ?
all bearings/seals will be replaced. You probably noticed that the previous owner fitted the clutch seal the wrong way....
Errr....yeah i did notice that...
Re: T5 aly with a 152 polini conversion.
Posted: Thu Jun 26, 2014 10:37 pm
by fastfrog
Jack221 wrote:Nice porting job fastfrog! What transfer and exhaust durations with the 2mm packer? And squish clearance and compression?
as expected: 125/180°
Squish1mm CR haven't checked head volume....
Re: T5 aly with a 152 polini conversion.
Posted: Fri Jun 27, 2014 7:08 am
by Jack221
So you contiuned with the cautious port timing
What was the duration of the boost port in the end?
I would start with a CR of at least 11 on this
Re: T5 aly with a 152 polini conversion.
Posted: Fri Jun 27, 2014 1:00 pm
by fastfrog
Boost port is lower at 120-1°. Looks actually like a Malossi's cylinder...
Re: T5 aly with a 152 polini conversion.
Posted: Fri Jun 27, 2014 4:39 pm
by Jack221
For me 120 boost is too low. should be the same as the main transfers as a minimum, if you want speed. Lower is only good for economy, which is not so interesting.
Malossi make good cylinders that go even faster when they are ported
Re: T5 aly with a 152 polini conversion.
Posted: Fri Jun 27, 2014 6:51 pm
by fastfrog
why should I? I made a child mistake when did my first timing checking...
Re: T5 aly with a 152 polini conversion.
Posted: Mon Jun 30, 2014 7:12 pm
by fastfrog
Black clouds are approaching:
I Found by accident a crack in the hole that support the cluster shaft. I guess it's quite a classical T5 issue. Rest of the case is free from any other crack. As I do not have any spare case left I'm gonna do a major welding job on it.
Along the black marks to stiffen the main fragile areas.
