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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Old 02-26-2001, 06:38 PM   #1
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How long does it take to install intake gaskets on tpi motor?

How long does it take to replace the intake gaskets on my 92 Z-28 TPI. Goes into bodyshop on Monday the 5th. Want done before then.

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Old 02-26-2001, 08:29 PM   #2
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If you never did it before but have the proper tools and take your time i'd guess around 2 hours. It's really a tough one because my 'quick' jobs turn into disasters (like 4 1/2 hours putting a new lokar dipstick in) but only 1-1/2 hours swapping a trans by myself. Murphys law seems to dominate. Stripping threads, breaking plasic harness clips are right up my alley. Figure on 2 hours.


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Old 02-26-2001, 10:45 PM   #3
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Figure maybe 6-8 hours time with a complete disassembly of the TPI, cleaning, etc....no use just taking it apart for the intake gaskets...TB will need cleaning, replace the EGR gasket while you're in there, o-rings for the injectors..etc...may as well do it now...

Then add another day for all the porting and gasket matching Click the image to open in full size.
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Old 02-26-2001, 11:02 PM   #4
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YOur right up my alley. Whats the best way to porting. I figure your right with the eight hours, with all the crap in there. Looks like all day friday and Saturday morning. Thank god I have those days off. Dont want to do it after the paint, I can here the scratch right now thinking about it. Thanks.

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1967 Pontiac Catalina 2 door fastback 400 v-8 auto cameo white dark red interior
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Old 02-27-2001, 07:41 PM   #5
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I spent about 8 hours replacing my runner/plenum gaskets and installing an AFPR. I didn't even pull the lower intake. Of course I port matched the runners/plenum and ported the plenum. I also cleaned everything up real nice and it was my first time. Next time it will be easier knowing where everything is. I would suggest port matching everything, hogging out the plenum behind the throttle body, and installing an AFPR while your in there. Heck, if I was pulling the lower intake I would be tempted to pull the heads for a valve job and some porting and throw in a ZZ4 cam.

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Old 02-27-2001, 09:35 PM   #6
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Quote:
<font face="Verdana, Arial" size="2">Originally posted by RODS92Z:
YOur right up my alley. Whats the best way to porting. I figure your right with the eight hours, with all the crap in there. Looks like all day friday and Saturday morning. Thank god I have those days off. Dont want to do it after the paint, I can here the scratch right now thinking about it. Thanks.

</font>

Rod,

IMO, there's only so much you can do...plenum EGR wals, blend back the plenum to runner holes...not much to the runners, maybe radius them a bit on the mounting area...they're really too think to do much with.

As far as the base goes, at the very least match the openings to the heads...they should be just *slightly" smaller on the base side, than the intake ports of the heads.

I used a bottle brush hone...it looks like a cylinder hone, the kind that has all the fat bristles on it, but it was a small one...found it at a dairy when I was a kid, used for cleaning something there...but the good thing about it is the flexible shaft..I ran it though the intake ports on the base to sorta smooth the flow path out.

I wasn't too worried about makeing the intake flow like a aftermarket base, because the intake ports on my heads are probably the worst I've ever seen...a few had a triangle looking shape to them.\

Anyway, as you're cutting out the Aluminum, go slow and easy..too little is better than too much.

Another tip...stick your shopvac into the opposite end of the port while you're die-grinding or dremmeling...keeps all the mess in the vac, instead of the shop and on you.

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Old 02-28-2001, 10:06 PM   #7
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Thanks for the replys. I'll probably start on it Thursday night. If I got any problems, I know where to go. Thanks again.

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Old 09-13-2011, 07:35 PM   #8
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Re: How long does it take to install intake gaskets on tpi motor?

dose any body have a video on this i heard it would take like two day i have a i roc z that has the l9 it only has like 300 miles on it but leaking oil hard to tell vary tight squeez but it looks like the top of the bell housing is wet im thinking valve cover or intake gasket whats your opinion Thanks
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Old 09-14-2011, 10:15 AM   #9
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Re: How long does it take to install intake gaskets on tpi motor?

A leak at the back of the engine could be the port where the Fuel Pump Switch is mounted. It's just to the drivers side of the distributor. Could also be the seal at the rear of the intake manifold.
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Old 09-14-2011, 10:15 AM
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