I know about the basics of porting/flowing but I have a few questions. Where can you buy thicker gaskets to raise the kit up when you've opened your exhaust port out, Do you need to upjet with porting or not ? And also the walls on the 70's kit are very thin from having the ports opened right up, is this safe ? They can't be any thicker than 1mm. What is the best shape to do the exhaust port ? It's a Polini sport the kit in question, Running a TT. Also, I know I need to read up a lot on flowing etc, But is there a way to measure how much would actually neeed to be removed, Because If I offer up this sport the ports are blocked so I can't see right into them, Is it to where it's level with the ports ? Sorry if I don't make much sence. Thanks.
why would you need a thicker gasget to raise the barrel after porting it? basicly, you have no idea what your doing, so dont attempt it. the sport is about right for the pipe you have, you would get a few gains from raising the port, but these will nbe met wiht equal losses elsewhere. the fact is, you have a sport kit, no idea anbout porting (my assumption from what you wrote above) and want more power wihtouit spending any money.. when REALLY you could just go and buy another kit, bolt it in and get WAY more power than is possible from porting your kit. a corsa is a ported iron kit, they really dont last long, sport/iron kits are made as best as they can be out the box prittymuch (bar a few lil tweaks) gaining more power seriously reduces there life. porting is NOT for amatures or people who have half an idea what there doing
Don't you remember my porting a 50's kit on there the sports kit you was helping me with ? I just thought it would be easier to open a new thread, I just wanted to know if you had to raise the kit after opening the exhaust port out, As you've seen I already have a standard sport and this one, and i'm working on a Mid-race engine. I'm just trying to figure everything out, Can't go right without going wrong first, In your last thread you showed me about using chemical metal to make something for the gasket to sit on, Can I use that to thicken a port wall where I think i've gone too thin ? Sorry If I'm sounding like a total twat. Not many things i'm good at, Seem'd I was half 1/4 at this, Maybe I was wrong lol. Thanks AnyWay.
you set the gasget based on the squish area in the head, then raising the port will lower the compression, if you wish to increase the compression you need a different head of smaller volume to correct the actual compression (as the port opens earlier) the only reason to drop/raise the barrel via the base gasget is if your using a longer stroke crank or lining the ports up by moving the barrel up or down so they match at bdc then making head changes... i do remember your other thread, but i answer every question as it comes, rather than remembering people, as information in responce to a question should be relevent to what is asked, not who is asking.. i dont want to encourage people to go bodging there kits up. everything you have asked is readily avalable in books covering performance tunning 2 stroke engines. use these as your first basis of questioning... as for lining up kits with cases, simply make a template of one and lay it over the other. but ye, deffo grab some books.. asking singular quesations on a forum is what there for, but asking something like "whats the basics of porting" is a little backwards, as porting is not atall basic, so there are no basics to it. its manipulating a whole load of different messurements against formula's and known procedures to gain one of 4 things, power, heat, fuel consumption or engine life. porting is about trading one for the other.. thats about as simple as i can put it wihtout going into the "chapter of a book" explinations, wich other people have done better than me years ago. so go find them and get reading
Haha, Cheers for the advice, Yeah I know I don't come across the easiest person to understand, I get confusssed when writing haha, Looks like i'm taking a trip to the shops to get some 2T tuning books then Thank-you.
