how to confirm if my 90 has pinapple sleeves??
02-10-13, 07:36 PM
#2
Full Member
Join Date: Jun 2005
Location: SoCal
Posts: 76
Likes: 0
Received 0 Likes
on
0 Posts
Pineapple "sleeves" are actually a part added to your existing sleeves to allegedly improve air flow when actuated. They have nothing to do with VDI. These sleeves are in the the 5th and 6th ports of your engines intake between the LIM and front and rear side housings. The part in question is a sort of rotary (not to be confused with rotary engine) valve that is actuated via exhaust back pressure around 3800 RPM (I think) to allow better breathing at higher RPM range. Go look at it on their website.
The only way to confirm that you have them is to remove your UIM and LIM and pull the valves out of the side housings.
The only way to confirm that you have them is to remove your UIM and LIM and pull the valves out of the side housings.
02-11-13, 08:25 AM
#4
Yes, but one small correction.
On the 86-88 models, yes, the auxillary ports (6PI I believe it's called) open via exhaust backpressure/flow.
On the 89-91's, they open via air pump pressure, where pressure is switched using a solenoid, triggered by the ECU. The VDI uses a similar setup to adjust intake runner length.
edit: removed some stuff since I saw thread title. Your user name confused me lol.
On the 86-88 models, yes, the auxillary ports (6PI I believe it's called) open via exhaust backpressure/flow.
On the 89-91's, they open via air pump pressure, where pressure is switched using a solenoid, triggered by the ECU. The VDI uses a similar setup to adjust intake runner length.
edit: removed some stuff since I saw thread title. Your user name confused me lol.
Trending Topics
02-12-13, 12:16 PM
#9
Pineapple aux ports inserts go into the stock ports that are simply locked into place into the stock ones with loctite.
The inserts help air move more efficiently by putting a curve over the dead spot in them where there is normally a 90 degree angle.
Www.atkinsrotary.com went further and made an entire assembly you can buy instead of using inserts.
Rotary >Pistons
The inserts help air move more efficiently by putting a curve over the dead spot in them where there is normally a 90 degree angle.
Www.atkinsrotary.com went further and made an entire assembly you can buy instead of using inserts.
Rotary >Pistons
Thread
Thread Starter
Forum
Replies
Last Post