T-III Installed height Qs

[Directconnection]

My factory FSM contradicts each other.... I have a '91 and a '92.

The '91 FSM says:

Closed: 1.590" @ 73lbs
Open: 1.344" @ 225lbs

The '92 FSM says:

Closed: 1.730" @ 115 to 127lbs
Open: 1.344" @ 255 to 275lbs

What gives? Now... 1.730" appears to be the correct closed/installed heights, but the 1.344 doesn't seem to be the correct open as that means the valve has a peak lift at .386" vs the .341 I measured (found a spec of .337 on allpar)

Even if they want you to test the open #s at .386" both the '91 and '92 FSM pressure #s for lbs just aren't the same.

Now the '91 FSM closed (installed height) seems wrong, too... at 1.590" and especially a low 73lbs.

Anyone have any input? I need exact #s so I know whether I need the increased installed height Ti retainers, or stockers are still ok with the cams I am using.

[Directconnection]

Nobody knows?

Can someone with a '93 FSM give me what they have to see if it's the same as my '92?

[zin]

I don't think you can get those pressures with the same spring. And while 70ish close might seem a bit low, the 92 FSM does seem a bit high... sorry I can't give you the answer, but maybe if you contact one of the main vendors they can give you a real-world setting.

Just getting another number from another book is kind of like wearing 3 watches set to different times... Which one is the right time? Time to ask someone who knows... Or wait for someone else to chime in!

At any rate, TTT!

Mike

[Pat]

Can't help you, but I think it's funny that if I needed the same info, I would have asked you! :-)

[Directconnection]

Can't help you, but I think it's funny that if I needed the same info, I would have asked you! :-)

Well, I would have given you the info I had and said: sorry, that's all I gotz! hehe

[Black93RT]

Nobody knows?

Can someone with a '93 FSM give me what they have to see if it's the same as my '92?

93 FSM says:
Turbo III Open 34.2mm (1-11/32in) at 255/275 lbs
Turbo III Closed 44mm (1.73 in) at 115/127 lbs