ottawaair
New member
what are the real gains of a porting job. I seen like 10+ hp on other posts but what does that feel like on the trail. is it like holy S***, this thing is completely different???
porting 99 srx cyl.'s
- Thread starter ottawaair
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Pauljones
New member
I have a 98 srx and I am curious about the same thing. Is it the most bang for your buck when starting with a totally stock sled? Does porting simply refer to removing the cylinder and enlarging and polishing the exhaust port? How would this affect the power valves? Do most members try to do this themselves, or do they take it to a machine shop? Anyone now a competent person around winnipeg, Manitoba?
bluewho
Active member
The best bang for your buck is good clutching over stock.Porting for trail use will not feal mutch differant untill again you setup your clutches for it.There will be a overrev condition because you make more power.
There is specs that a moter builder follows of his own or has purchased from a company to open ports to a predetermaned size.The exhast port is left alone unless differant size bore is used or head\decking work done.
There is specs that a moter builder follows of his own or has purchased from a company to open ports to a predetermaned size.The exhast port is left alone unless differant size bore is used or head\decking work done.
mopar1rules
Active member
bluewho said:
blue who-----not true. the exhaust port is where approx 60% of the power is to be unleashed. don't need to wait for some cylinder boring, or cylinder decking work to be done, to start working on the exhaust. little hint.....those auxillary exhaust ports look pretty small, don't they??
ottawaair-----a properly ported cylinder, will give you a noticable increase in throttle response, it will be quicker @ picking up rpms, and you will be able to handle a more aggressive clutch setup, do to the added horsepower. if you have your srx ported and try running it again, with the OEM clutch setup, you will be over-reving, from the added horsepower, like already stated.
Pauljones-----no need to polish the exhaust port, so you can see yourself in it. you need nothing more than a smooth sanded finish.....120 to 180 grit. people think that a polished exhaust port or intake is what makes the power.....totally a myth. the only reason to smooth/polish out the exhaust ports surface finish, is only to keep oil from sticking, and then burning, creating carbon. also, never polish the intake or anything like that, that's intaking the mixture into the cylinder. YOU WILL LOSE HP BY DOING THAT. you want a slight rough finish, to help the mixture get atomized more. otherwise if its polished soo smooth, the fuel mixture just beads on the surfaces and doesn't get mixed as throughly, so the hp goes down. i've heard of guys getting all their ports polished up to they could see thereselves in them, and then when they went out on the dyno to see what HP gains they were expecting to see, they saw nothing but a 4-5 hp drop!! the surface finish of a fine bead blasted surface, is more than smooth enough for transfer ports, boost port, and anything on the intake skirt of the cylinder. just enough surface roughness, to help aid fuel mixture atomization.
also, for those that want to do it themselves, and their buddies told them to just go in there and make all the ports bigger, don't listen to that for a second. you will "F" stuff up, quicker than you can blink. there's times where it takes no more than raising a port 1mm or less, to get the required time/area value or duration needed, to match the desired BMEP @ that rpm. and every motor is different.....meaning, what you did w/the ports on that ski-doo motor or whatever, isn't necessarily what you will be doing on your srx. the manufacturers have some ports already good enough. you only got to help out the ports that lack. also, what the engine is used for, dictates what the porting layout is kinda going to be.
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Triple X
New member
ottawaair said:
Line up against someone that has a ported SRX and you will see the difference.
YAMMIEGOD3:16
Active member
WHAT YOUR GONNA SEE IS HIS TAIL LITE IF THE PORTED SRX IS SPOT ON. 3:16 (yammie tony)
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VmaX 600
New member
Where is a good spot to have it done and what does it cost?
bluewho
Active member
I left the entrance for the large exhast port alone on mine and matched the exits up to the gaskets and removed the weld buldge on the manifold pipes when i ported mine .
Along with the other work.
But you are right if done by a pro he has a match to what should be done.
I had to add a few grams and picked up about 5 mph topend.
Along with the other work.
But you are right if done by a pro he has a match to what should be done.
I had to add a few grams and picked up about 5 mph topend.
SiR X700
New member
GOOD traction also helps.........1.25 track really helps alot too
SWEDE
New member
Get in touch with Mr. Viper 700 over on Hardcoresledder and he'll hook you up.He does awsome work at a fair price.Another guy who I've heard good about is Lowell Horning out in Arizona, google his name and it will come up.
rx1jim
New member
I have heard Justin Fuller of Full Power Performance does excellent work. He is located in NY, I believe near Old Forge, NY. I bought a 2000 SRX from a member of this site a few years ago. I has been prrted by Justin.