shortrunner mod?

K7cobra · October 29th, 2011, 07:39 PM

Hay guys what's up dose any one have the how to for the short runner modd I cant find it anywere

DickH · October 30th, 2011, 02:21 PM

Talking about a short runner intake? Requires cutting up your intake to shorten the length of the intake runners.

K7cobra · October 30th, 2011, 04:11 PM

Yeah that's what I was asking about I was trying to find out how much to cut off, and how to seprate the runners from the intake and what's needed to re attach them

Mach Boy · October 30th, 2011, 09:36 PM

It's not worth it on a bolt-on car. You may even lose power.

WickedSnake00 · October 31st, 2011, 08:37 AM

Originally Posted by Mach Boy

It's not worth it on a bolt-on car. You may even lose power.

Short runners are for high RPM, high flow rate high power applications. Kiss low end torque goodbye with short runners.

Short runners = low velocity, high flow rate.

bitemark46 · October 31st, 2011, 10:28 AM

You guys are both wrong. I did a shortrunner on my car and I picked up 4rwtq at peak. Under the curve was identical to the numbers before I cut the runners. For my bolt-on car, I picked up 16rwhp and 4rwtq at peak. Under the curve it was as high as 30rwhp.

OP, you'll need a torch that uses MAPP gas. Propane doesn't get hot enough. Cut 1.5" off the runners and glue them back in with JB Weld Industro. Gasket match the ports to the IMRC's and file down the bosses..

Google "David Simmons short runner intake". I forgot the link but he has pics an a step to. Not sure if the site is still up though.

BMR Tech · October 31st, 2011, 10:48 AM

^ Correct.

If it is done properly....low and mid range will stay where it's at....and the upper curve will gain tremendously.

K7cobra · October 31st, 2011, 07:43 PM

Thanks for the info when I do this I'm going to port the intake and maby the heads my self

na svt · November 10th, 2011, 11:33 AM

Originally Posted by Mach Boy

It's not worth it on a bolt-on car. You may even lose power.

Originally Posted by WickedSnake00

Short runners are for high RPM, high flow rate high power applications. Kiss low end torque goodbye with short runners.
Short runners = low velocity, high flow rate.

Holy bad information Batman!

A properly made short runner, B head intake adds 15-20rwhp without hurting mid range hp or tq.

Mach Boy · November 10th, 2011, 06:45 PM

Originally Posted by na svt

Holy bad information Batman!

A properly made short runner, B head intake adds 15-20rwhp without hurting mid range hp or tq.

Then why did your short runner lose power on ModularSpeed's car? Is it because his car was a C head? I'm not trying to be a dick but I was basing what I said off of the results of your intake.

na svt · November 10th, 2011, 06:55 PM

Originally Posted by Mach Boy

Then why did your short runner lose power on ModularSpeed's car? Is it because his car was a C head? I'm not trying to be a dick but I was basing what I said off of the results of your intake.

Kelly's was a C intake and this thread is about B intakes. B head short runners are totally different and when there is only 1.5"-2" of runner length removed the power gain will always be 15-20rwhp and there will be little to no tq loss when properly tuned.

Also, I said that my 8" short runner had issues on his car. The 10" and 5", "C" short runners work great.

musclemerc · November 10th, 2011, 08:40 PM

+1.........

Mach Boy · November 10th, 2011, 09:01 PM

Originally Posted by na svt

Kelly's was a C intake and this thread is about B intakes. B head short runners are totally different and when there is only 1.5"-2" of runner length removed the power gain will always be 15-20rwhp and there will be little to no tq loss when properly tuned.

Also, I said that my 8" short runner had issues on his car. The 10" and 5", "C" short runners work great.

Ok thanks for clearing that up. I tried to look up the threads on other websites but they got deleted or I just couldn't find them.

na svt · November 10th, 2011, 09:14 PM

Originally Posted by Mach Boy

Ok thanks for clearing that up. I tried to look up the threads on other websites but they got deleted or I just couldn't find them.

The term "shortrunner" can be used to identify any intake that has it's runners shortened, but there are many versions. B heads have basically two version, one with runners shortened 1.5"-2" and the other has runners about 3" long. The longer versions (shortended 1.5"-2") have minimal losses down low but add 15-20rwhp at peak and 30-35 at 7k.

For C intakes they range from 10"-8" and the 5.5." The 8", for some reason, works great with FI but sucks on n/a combos. The 5.5" kills tq and mid range but kicks ass up top. The 10" has minimal midrange and tq losses and moderate peak hp gains but slows the drop off of power after peak, making abour 30rwhp more at 7k.

K7cobra · November 12th, 2011, 02:50 PM

ok i shift my car at 7200 rpm so would this defently be worth it for me and thats a stupid question because any hp is good hp im just looking at whats best for drag racing

na svt · November 12th, 2011, 03:00 PM

Originally Posted by K7cobra

ok i shift my car at 7200 rpm so would this defently be worth it for me and thats a stupid question because any hp is good hp im just looking at whats best for drag racing

It would most definitely be a good mod for you.

K7cobra · November 12th, 2011, 03:04 PM

cool ill have to get started on it in a week or so

October 29th, 2011, 07:39 PM	#1
K7cobra Regular 1998 svt cobra 13.00@104 Join Date: Jul 2010 Location: pittsburgh pa Posts: 371 iTrader: 0 reviews	shortrunner mod? Hay guys what's up dose any one have the how to for the short runner modd I cant find it anywere __________________ sponsored by auto service and performance and allegheny county customs 98 cobra mods-flowmasters 40s bassini x pipe underdrive pullies diablo tuner pro 5.0 shifter 373 gears 1999 big block project car

October 30th, 2011, 02:21 PM	#2
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 4,189 iTrader: 2 reviews	Talking about a short runner intake? Requires cutting up your intake to shorten the length of the intake runners. __________________ 2003 Mustang gt - usual mods - slowly working on 5.4 swap 2004 srt4 - Stock DD/winter beater Click here for your tuning needs Before asking a gearing related question click THIS link and enjoy all your saved time.

October 30th, 2011, 04:11 PM	#3
K7cobra Regular 1998 svt cobra 13.00@104 Join Date: Jul 2010 Location: pittsburgh pa Posts: 371 iTrader: 0 reviews	Yeah that's what I was asking about I was trying to find out how much to cut off, and how to seprate the runners from the intake and what's needed to re attach them __________________ sponsored by auto service and performance and allegheny county customs 98 cobra mods-flowmasters 40s bassini x pipe underdrive pullies diablo tuner pro 5.0 shifter 373 gears 1999 big block project car

October 30th, 2011, 09:36 PM	#4
Mach Boy MM's Orangest 2004 Mach 1 Mustang Join Date: Sep 2007 Location: Indy Posts: 2,846 Blog Entries: 1 iTrader: 1 reviews	It's not worth it on a bolt-on car. You may even lose power. __________________ Looking for 03/04 4V ABS Wiring Harness Connector/Incomplete Wiring Harness (with ABS connector)

October 31st, 2011, 10:28 AM	#6
bitemark46 Regular Join Date: May 2008 Location: Tampa, Fl Posts: 397 iTrader: 0 reviews	You guys are both wrong. I did a shortrunner on my car and I picked up 4rwtq at peak. Under the curve was identical to the numbers before I cut the runners. For my bolt-on car, I picked up 16rwhp and 4rwtq at peak. Under the curve it was as high as 30rwhp. OP, you'll need a torch that uses MAPP gas. Propane doesn't get hot enough. Cut 1.5" off the runners and glue them back in with JB Weld Industro. Gasket match the ports to the IMRC's and file down the bosses.. Google "David Simmons short runner intake". I forgot the link but he has pics an a step to. Not sure if the site is still up though. __________________ -Mark- 98' N/A Cobra (Stock longblock) 11.79 at 114.64 (1.62 60ft)

October 31st, 2011, 10:48 AM	#7
BMR Tech Authorized Vendor Join Date: Feb 2009 Posts: 748 iTrader: 0 reviews	^ Correct. If it is done properly....low and mid range will stay where it's at....and the upper curve will gain tremendously. __________________ Kelly Aiken "The Ford Guy" BMR Suspension Inc kelly@bmrsuspension.com 813.986.9302 CLICK IF YOU LIKE BMR SUSPENSION

October 31st, 2011, 07:43 PM	#8
K7cobra Regular 1998 svt cobra 13.00@104 Join Date: Jul 2010 Location: pittsburgh pa Posts: 371 iTrader: 0 reviews	Thanks for the info when I do this I'm going to port the intake and maby the heads my self __________________ sponsored by auto service and performance and allegheny county customs 98 cobra mods-flowmasters 40s bassini x pipe underdrive pullies diablo tuner pro 5.0 shifter 373 gears 1999 big block project car

November 10th, 2011, 08:40 PM	#12
musclemerc Newbie Join Date: Feb 2011 Posts: 23 iTrader: 0 reviews	+1.........

November 12th, 2011, 02:50 PM	#15
K7cobra Regular 1998 svt cobra 13.00@104 Join Date: Jul 2010 Location: pittsburgh pa Posts: 371 iTrader: 0 reviews	ok i shift my car at 7200 rpm so would this defently be worth it for me and thats a stupid question because any hp is good hp im just looking at whats best for drag racing __________________ sponsored by auto service and performance and allegheny county customs 98 cobra mods-flowmasters 40s bassini x pipe underdrive pullies diablo tuner pro 5.0 shifter 373 gears 1999 big block project car

November 12th, 2011, 03:04 PM	#17
K7cobra Regular 1998 svt cobra 13.00@104 Join Date: Jul 2010 Location: pittsburgh pa Posts: 371 iTrader: 0 reviews	cool ill have to get started on it in a week or so __________________ sponsored by auto service and performance and allegheny county customs 98 cobra mods-flowmasters 40s bassini x pipe underdrive pullies diablo tuner pro 5.0 shifter 373 gears 1999 big block project car

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