headwork
though none of you here have the 1.9L *lol* i just thought i'd share though. i got my spare head into the machine shop today for all the work thats getting done to it:
- shaved .055, you can actually go to .060 on the 1.9L heads but you then have to start shortening bolts, dowels, etc....not what i want to start fucking with - port and polish, basically just making all of the factory machine marks dissapear, nothing special - high lift cam installed, stock specs: 432 lift 215 dur. (exaust/ intake lift dur. the same) the new cam wich i picked up for a good price is the one that Gude used to make, 475 lift 252 dur. and yes this cam DOES work with all the stock equipment - new cam seal and valve guide seals and since i got referred to this shop by a friend of the owner total cost is 120 bucks, not to bad... now all i need is my new engine :cool: |
holy crap thats cheap... sweet deal!
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just a question for you, shaving, porting and polishing alone, no cams, what kind of a gain can you expect to get... i've got a buddy thats dieing to do it on my car, just can't trust him till i do my research.
peace |
Originally posted by demoninvictus just a question for you, shaving, porting and polishing alone, no cams, what kind of a gain can you expect to get... i've got a buddy thats dieing to do it on my car, just can't trust him till i do my research. peace |
Originally posted by RX7_2ner I'm gonna say 5-10hp. Most newer OHC heads flow very well. So, I wouldn't expect much from a simple port&polish. |
i'm trying to get a general idea guys, thats all, just about how much you can shave off the head, what kind of a gain you can expect from it. the guy thats doing this is used to working on chevy's. honestly, i have to look deeper into this crap before i even bother. to tell you the truth, i'm probably not going to get it done till later this summer. i don't trust my friend to do it, nor do i think my engine would last that long if i let him touch it. and obviously, if you have 1900+ cc's and i'm limited to 1823cc's, we're talking big differences in the amount of material that you're able to remove from the engine to increase capacity.
peace |
Originally posted by demoninvictus and obviously, if you have 1900+ cc's and i'm limited to 1823cc's, we're talking big differences in the amount of material that you're able to remove from the engine to increase capacity. peace |
Originally posted by 240SXSR20DET engine displacement doesnt have anything to do with it... head design does... |
Hey, I've got the 1.9, thanks for posting! :) I've been actually thinking of doing some engine work to the 1.9 after this autocross season, just to see how far I can take it.
With your TB swap and exhaust, etc.. have you noticed a decrease in torque at all, at lower rpm ranges (taking off, launching, etc...) I had a 3.8TB on for a while, but took it back off since i seemed to be able to launch better than with the 3.8tb. How much will the increased compression and different lift/duration affect the powerband? is it going to be a high-winding engine, or a more torquey 'punchy' engine, do you think? --sarge |
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