Ported plenum.. - Page 2 - ZR-1 Net Registry Forums

LGAFF · 09-10-2015

2ndrys are in the head....no need to port match the 2ndry as they are already 35-36mm

Billy Mild · 09-10-2015

I thought the secondaries were actually in the injector housings. I am referring to the valves themselves.

LGAFF · 09-10-2015

You can port and leave them in the head.....the 2ndry ports are full sized 35-36MM in the head

XfireZ51 · 09-11-2015

Quote:

Originally Posted by Billy Mild

I thought the secondaries were actually in the injector housings. I am referring to the valves themselves.

The secondary throttle plates are in the cylinder head at the IH/Cylinder head interface. As Lee stated, when I port matched to the IH, I only did the primary ports. I did do the head match w the heads on the motor. My garage looked a bit like a a surgical theatre w plastic wrap over the motor and only an opening over the cylinder I was working on. Used pillow foam to block the runners and would vacuum everything before removing that. As a final, I used 6" QTips dipped in Vaseline to clean up any burrs by the valves.

Paul Workman · 09-11-2015

Quote:

Originally Posted by XfireZ51

The secondary throttle plates are in the cylinder head at the IH/Cylinder head interface. As Lee stated, when I port matched to the IH, I only did the primary ports. I did do the head match w the heads on the motor. My garage looked a bit like a a surgical theatre w plastic wrap over the motor and only an opening over the cylinder I was working on. Used pillow foam to block the runners and would vacuum everything before removing that. As a final, I used 6" QTips dipped in Vaseline to clean up any burrs by the valves.

Yep! Same here ^^^, except I did remove the secondary plates at that time as I went to 37mm on the plenum and runners. So, a little port match on the secondary runner was needed, and a quite a bit more on the primary side, of course.

Engine covered w/ plastic shower curtain. Only the port being worked on exposed (see ball gauge used to check clearance into the head(s).

Oiled, blue shop towels (x2) stuffed into the bottom of the ports to catch debris.

Karl · 03-04-2024

Pete and Marc both do porting.

09-10-2015	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,191	Re: Ported plenum.. 2ndrys are in the head....no need to port match the 2ndry as they are already 35-36mm __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

09-10-2015	#2
Billy Mild Join Date: Aug 2014 Location: Kansas City, MO Posts: 838	Re: Ported plenum.. I thought the secondaries were actually in the injector housings. I am referring to the valves themselves. __________________ Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration

09-10-2015	#3
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,191	Re: Ported plenum.. You can port and leave them in the head.....the 2ndry ports are full sized 35-36MM in the head __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

03-04-2024	#6
Karl Join Date: May 2013 Location: Chicago Posts: 977	Re: Ported plenum.. Pete and Marc both do porting. __________________ 1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black Sold 1985 L98 Blue On Blue Sold