porting questions?
Thread Starter
Philip loves his 7
Joined: Mar 2008
Posts: 44
Likes: 0
From: Virginia
porting questions?
ok so im sure their is like 40 billion post on this already but searching for that can take a long time to find the right threads so dont get mad and me. ok but on the the questions on hand, so i just purchased a 89 n/a and i am going to start upgrading and i know their is a few diff types of porting. street, and racing, but what i am looking for is how hard is it for a person with moderate know how in auto mech to do and is it easy to mess it up? and if its not possible how much would i be looking at if i wanted to get a shop to do it for me?
its VERY easy to screw up port work if you havent had practice.
Porting almost always means rebuild a motor anyway.
porting jobs can cost from $300 and up depending on the size of the port.. mild street, aggressive street, half-bridge, full D or J bridge, monster port, peripheral port.
porting to rotaries does the exact same thing as changing cams on a piston motor..... you will shift the power band more to the right and the peak power will be "peaky" and you will lose bottom end power.
my suggestion as well as other who will chime in is to: go either mild or aggressive street port..... you will never see any benefit of anything more than that on the street.
rebuild street price - between $1k(if you do it yourself) to $1,500+ if you get a shop to do it and dependent if any major engine parts need replacement.
porting street price - $????? this should be left to the shop that does the rebuild.
you'll end up spending about $2k+ for a rebuilt street ported motor.... and the price is on the VERY LOW side
Porting almost always means rebuild a motor anyway.
porting jobs can cost from $300 and up depending on the size of the port.. mild street, aggressive street, half-bridge, full D or J bridge, monster port, peripheral port.
porting to rotaries does the exact same thing as changing cams on a piston motor..... you will shift the power band more to the right and the peak power will be "peaky" and you will lose bottom end power.
my suggestion as well as other who will chime in is to: go either mild or aggressive street port..... you will never see any benefit of anything more than that on the street.
rebuild street price - between $1k(if you do it yourself) to $1,500+ if you get a shop to do it and dependent if any major engine parts need replacement.
porting street price - $????? this should be left to the shop that does the rebuild.
you'll end up spending about $2k+ for a rebuilt street ported motor.... and the price is on the VERY LOW side
The reason why searches take a long time is because impatient people like you create threads like this. It's a vicious cycle, you see.
If this will be your first rebuild, and you want to port it, practice on some scrap irons/housings before doing it for real on good parts. Atkins has a nice rebuild video, as does DIY 13B, and others.
If you want someone to do the porting for you, the prices usually start from $350 (http://rotaryresurrection.com/2ndgen/engine_prices.html)
The most expensive mistakes you'll make are when you're doing the first motor. Set aside a "mistake fund" for insurance.
Good luck!
If this will be your first rebuild, and you want to port it, practice on some scrap irons/housings before doing it for real on good parts. Atkins has a nice rebuild video, as does DIY 13B, and others.
If you want someone to do the porting for you, the prices usually start from $350 (http://rotaryresurrection.com/2ndgen/engine_prices.html)
The most expensive mistakes you'll make are when you're doing the first motor. Set aside a "mistake fund" for insurance.
Good luck!
Senior Member
Joined: Mar 2002
Posts: 409
Likes: 0
From: Logan Utah
Take a trip on over to www.nopistons.org/forums
Take a look at their engine building/porting section and be prepared to do a lot of reading. From there, you can asses your damages (pocket book) and go from there.
Take a look at their engine building/porting section and be prepared to do a lot of reading. From there, you can asses your damages (pocket book) and go from there.
Paul Bonner
Joined: May 2005
Posts: 24
Likes: 0
From: nashville, TN
Look at this site, best info I've found on porting. http://www.rotaryengineillustrated.com/porting/15.html
I have to use Firefox to see the photos, but on some computers Internet explorer will pull up the pics. I have spent many hours searching this site for porting info, and never found a comprehensive overview of porting. I have not been able to find any good books on the subject either, so hopefully this website helps. Once you know the basics, you may get some good feedback on specific questions from some very knowledgeable people here. The problem will be in differentiating the informed comments from the useless ones.
I have to use Firefox to see the photos, but on some computers Internet explorer will pull up the pics. I have spent many hours searching this site for porting info, and never found a comprehensive overview of porting. I have not been able to find any good books on the subject either, so hopefully this website helps. Once you know the basics, you may get some good feedback on specific questions from some very knowledgeable people here. The problem will be in differentiating the informed comments from the useless ones.
Thread Starter
Philip loves his 7
Joined: Mar 2008
Posts: 44
Likes: 0
From: Virginia
well i dont think ill be able to port any time soon due to money issues and i should prob learn more about this and practice because im one of those i like to do all the work myself guys but thanx for the help, and yea i am pretty impatient when i have other things to do other than set here and search for an hour an half just to find 1 post.
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