Porting - Page 3 - ZR-1 Net Registry Forums

cuisinartvette · 12-09-2007

Flowing parts on a bench is pretty cheap, the problem is making the fixture to flow the IH and plenum, that would take some time and most shops wont be willing to do it unless you pony up. If ports are siamesed flwing doesnt make much sense at that point to get a true reading...jmo..

bradslt5 · 12-09-2007

I agree wouldnt you have to make a divider that would seal each port in order to get a somewhat accurate reading. and even after that it would be a guess?

Locobob · 12-18-2007

Flow bench testing really isn't necessary unless maybe you are playing around with different port designs / configurations. The basic ingredients for a port job on a lightly modded 350 cid LT-5 are pretty simple: 36mm plenum ports, 36mm ports at the top of the injector housing, taper down to near stock size at the bottom of the primary runners (unless heads are ported), remove most of the huge primary injector boss (90-92 only), port match plenum to injector housings. Port to port consistancy is maintained by frequent measuring with telescoping gauges and or ball gauges.

flyin ryan · 12-18-2007

Quote:

Originally Posted by Locobob

Flow bench testing really isn't necessary unless maybe you are playing around with different port designs / configurations.

the top people in the industry right now, Pro-Stock & Cup, hardly even use dry benches these days. way too much going on for those to be relevent. wet bench testing on the other hand

cuisinartvette · 12-20-2007

Did this just today...The intake port (on the left) alone took me 6 hours, and its still not 100% done, probably another hour or so left in it.
(95 LT1 head)

12-09-2007	#21
cuisinartvette Join Date: Aug 2005 Location: San Fernando Valley, CA. Posts: 896	Re: Porting Flowing parts on a bench is pretty cheap, the problem is making the fixture to flow the IH and plenum, that would take some time and most shops wont be willing to do it unless you pony up. If ports are siamesed flwing doesnt make much sense at that point to get a true reading...jmo.. __________________ 1990 ZR1, 142,000 miles-Black on black 4.09's Haibeck chip, 3"exh, K&N, meth inj.

12-09-2007	#22
bradslt5 Join Date: Oct 2007 Location: lone pine and mammoth lakes ca. Posts: 544	Re: Porting I agree wouldnt you have to make a divider that would seal each port in order to get a somewhat accurate reading. and even after that it would be a guess?

12-18-2007	#23
Locobob Join Date: Jan 2004 Location: Portland, OR Posts: 1,057	Re: Porting Flow bench testing really isn't necessary unless maybe you are playing around with different port designs / configurations. The basic ingredients for a port job on a lightly modded 350 cid LT-5 are pretty simple: 36mm plenum ports, 36mm ports at the top of the injector housing, taper down to near stock size at the bottom of the primary runners (unless heads are ported), remove most of the huge primary injector boss (90-92 only), port match plenum to injector housings. Port to port consistancy is maintained by frequent measuring with telescoping gauges and or ball gauges. __________________ Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368

12-20-2007	#25
cuisinartvette Join Date: Aug 2005 Location: San Fernando Valley, CA. Posts: 896	Re: Porting Did this just today...The intake port (on the left) alone took me 6 hours, and its still not 100% done, probably another hour or so left in it. (95 LT1 head) __________________ 1990 ZR1, 142,000 miles-Black on black 4.09's Haibeck chip, 3"exh, K&N, meth inj. Last edited by cuisinartvette; 12-20-2007 at 12:19 AM.