Shaving N42 head on L28 block with dished pistons. I want 9:1-9.5:1 compression?

Dan said:

You'd get a bit more off-boost grunt, but it would limit the amount of boost you can run and/or require you to pull more timing sooner.

Click to expand...

At least dan admits ahead of time that he's going to parrot something...

Problem is it's half right and half wrong...

There won't be any practical advantage or discernable 'off boost grunt'---and the CR is far too high to be effective with the detonation prone chamber.

Keep the CR Low, spend money on porting and proper cam selection and a stock L28ET with 7.4 CR will make close to 380ft-lbs of torque at 8psi. That's pretty good grunt if you ask me. With proper turbo selection on the hot side, and good compressor flow, even the small 2-3 psi of boost you get when you lug it and go WOT before boost threshold will make you forget alllll about what poor N/A guys would consider 'good low end grunt'...

Do some calcs on your stock 8.X cr, 2-3 psi and 2000rpms and see what you get compared to the measly BMEP increase by a couple points of CR which will cause you nothing but heartache when you realize CR isnt power ,boost is...and more importantly, not boost, but FLOW!

"14psi" on the right porting, right cam, and right turbo will give you nigh near 400hp. On a stock turbo bottom end. On a stock 8:1 CR bottom end, it will be similar, but tuning will be far more critical. No methanol, no water injection, no tricks. Nothing changes when you go turbo...flow is flow. It's just people think boost is the answer and it's only half the equation...

You guys act as if I have an entirely uneducated plan. I'm not doing anything because it sounds good, I'm doing something because I like to fix my cars and improve their performance at the same time. I have a spare block I'll be building for boost, I'm building this one for N/A. My current engine is under 100K and has a very slightly leaking head gasket, so I need to replace that before it causes excessive corrosion or leaks fast enough to cause problems. I will most likely need to resurface the head in order to get a fresh surface. I'm not a dumbass or a parrot just because I'm not a post *****. I do **** good head porting and rebuilding and this is certainly not my first engine build. I just need more solid advice for setting up this engine.


I'm also installing the comp cam with a bit more lift (.460) and duration (236 at .050" 280 at .020") so the bump in compression would help maintain dynamic compression.



So you guys suggest to just shave it the minumum amount and run it? I guess that couldn't hurt... it's already faster than a stock EVO, it should only be faster with the help of the upgraded cam. I just don't see what the big problem is with trying to get a better combustion chamber size and increase compression. I guess I could just leave this engine relatively unmolested then start piecing together my turbo kit...

Wow. I'm referring to the people that are post whores. You know, the guys with 1000+ posts. I'm not referring to your technical ability, I'm just saying that I spend more time wrenching and beating bush than posting on forums. Just because I don't live on my computer doesn't mean I am not a competent mechanic. Once again, you are assuming things. Just because I don't have thousands of posts does not mean to guys should assume I haven't done my research. You guy spend more time assuming than thinking.

The only useful reply I got was in a PM, from a very polite individual. I think he didn't want you asshats to rag on him for helping a fellow enthusiast.

I know you can reshape the combustion chamber by welding. If I was interested in that, I would have done it. I wanted to go this route for a reason: cost effectiveness. I don't have a TIG welder at home.

Tony, You seem like a bag of used douche fluid and like to prance about cyberspace with your holier than thou attitude when you have no chance of possible physical reprocussions for your behavior. Stop being so presumptuous and defensive. That first sentence was inappropriate on my part. I'm an *******. I do know my **** however, and I don't disrespect people without being provoked.


**** this forum, The majority of the users know less than myself, and the ones that know more are too busy answering the wrong aspects of my questions. I appreciate your replies and attempts at clearing my logic, but I'm too far gone for help at this point. I'm doin my own thing, I'm not sharing any more performance tips. I'll keep my tips and advice to myself from now on. I've built the fastest N/A 240SX I've heard of. Find me a better time than 14.6 with a KA24E in a 240sx with full interior, a passenger, and AC, and I'll shut my mouth. Those cars run a high 16 stock. I worked some magic on the ports, put in a race cam, and got it in the range of stock SR20det cars. Granted it only lasted 8,000 miles in that trim, it still hauled ass. I didn't need anyones help for that and I already got the help I needed for this build. I don't know what the **** you've done, but unless you have the fastest driveable car of its type, you probably haven't done work on my level.

"Wow. I'm referring to the people that are post whores. You know, the guys with 1000+ posts. I'm not referring to your technical ability, I'm just saying that I spend more time wrenching and beating bush than posting on forums. Just because I don't live on my computer doesn't mean I am not a competent mechanic. Once again, you are assuming things. Just because I don't have thousands of posts does not mean to guys should assume I haven't done my research. You guy spend more time assuming than thinking. "

Boy, that's the fire calling the kettle black! "Assume"? Tell me kid, how many years does it take for someone to reach 1000 posts? And if they were here for say...what? Close to 17 years.... I guess you would be a 'post *****' by your own definition!

As for this little ditty:
"Tony, You seem like a bag of used douche fluid and like to prance about cyberspace with your holier than thou attitude when you have no chance of possible physical reprocussions for your behavior"

"Bring it on" -- I'm at MSA EVERY YEAR. Last loudmouth kid that was going to give me 'physical reprocussions (sic) for my behavior" asked someone at that event "Is that Tony D...he doesn't look like that in the internet photos" as they sulked away without ever even INTRODUCING themselves. At the same event, another Zcar.Com guy heard me talking and said "Holy sh*t, you REALLY DO talk that way to people's faces! I thought it was just an act." No, with me what you see it what you get, no hiding behind the internet and some shield of anonymity like the kids like to do. I've paid a visit to more than one internet loudmouth (on more than one continent, matter of fact) and asked them in person what their problem was with what I said. In every instance they decided that what I said wasn't worth making the same statement in person as they had online... PM me your address, I can look you up next time in town and we can discuss it.

And to nip all this young-kid chest beating B.S. in the bud, I'll jump down to your most Ludicrous ASS-U-mption:

"I don't know what the **** you've done, but unless you have the fastest driveable car of its type, you probably haven't done work on my level."

Would that be certified by FIA, or merely an American body? Car # 220, Two Flags Racing, AA Flag Driver. FASTEST 3 LITER PRODUCTION CAR IN THE FU*KING WORLD as registered in FIA and SCTA, at Bonneville, Muroc, and El Mirage. Over 17 World Records to the cars credit, in F/PRO, F/GCC, F/ALT, and some 'rescinded due to protests' records in several other classes.

All with the L-Engine. Running since 1999.

Does that piss high enough on the wall for you... where were your 'fastest 240SX that you heard of'? See, the fastest 240ZX that I've heard of is run by the McMeekin Brothers, and they're over 200mph. So maybe, just maybe you aren't as badassed as you think you are, maybe the 'I've heard of crew' you hang with just isn't that informed. Maybe, just maybe I do know what I'm talking about, because unless YOU aren't going over 200MPH at Maxton maybe you DON'T have 'the fastest N/A 240SX'....

My tag line once read 'there's always someone faster, so what's the point?' I think you need to learn that one. I do have the 'fastest driveable car of it's type' (even if it is a 2+2)... and I also happen to know the guy who owns and runs the Fastest S30 Coupe on the face of the planet as well. Great Guy. Thing is, he bought his engine. I built mine in the garage out back of Andy's House in Clairmont.

Some people have money, others...well they make do with what they have. I think I done pretty well. Maybe not work on your level... I mean, FIA Group 4 is pretty much a cakewalk, and having the fastest production 3 liter on the face of the planet as recognized by SCTA and FIA (again, other than 'you know of' where were your 'fastest' records logged???) seems to say that maybe you're the one full of crap. In any case, it looks like YOU'RE the one making stupid ASS-U-mptions, and not I.

I called your next move like a chessmaster. And you played right on cue. If this wasn't so ENTERTAINING, it'd be boring. Actually, it IS boring. You guys.... you're all the same. (Yawn)

Oh, I forgot...

http://www.scta-bni.org/Bonneville/BNIrecs_cat_e.htm

Go ahead, look right there: F/PRO, it's still up on the official website. ****, we got our cover on the RECORD BOOK one year (overall points champion)...**** I got a nice black jacket around someplace I got for that one...

And in a nice surprise, looks like we don't have the fastest F/GCC, F/ALT car anymore. Those guys at Hondata and their big sponsorship bumped that record pretty well, by almost 20MPH. Impressive! But I do see my friends the McMeekin Brothers STILL are running 226mph in their 240SX... so what was your car's number/name again MX500? Fastest where again?

But we still go the record for F/PRO for as long as that lasts. And as long as we made it in the record book I can legitimately claim I had the 'Fastest S30 on the face of the planet' at one time. That, of course, opposed to someone on the internet claiming it in a childish chest-beating rant. (Remeber boys and girls, I said it was coming: "you don't know me, you don't know what I've done" ---blah blah blah! Who cares, there's always someone faster what's the point of bragging about it unless you need it to stroke your PP...

Oh, and if you're going to parse the pepper with boxing gloves...

Yes, technically Burton has the 'faster' time in F/GT at 172.974 mph, but our (now broken) record is still faster (173.325 mph)... you can't look that one up on the internet, you have to have the record books. Every year since we broke that record it's been listed. I don't feel like scanning it, I don't need to prove it's true. Unlike an internet boast qualified by the phrase "That I know of" my boasting credentials came from a third party who impartially decided I was the fastest kid on the block...for now.

Anything else, kid? I really do have to get back to work. It's not that I 'sit all day on the internet', I've just been here a while, and spend a lot of time helping people out. I'm not a PO&B kid out to take down the big fish to make myself look bigger.

Good Luck in your build, I'm sure you will be eminently successful. When you grow a set, come on up to Bonneville (or out to El Mirage) and maybe we can test your mettle where someone will watch. ****, I may be up to making a trip to Maxton. Which are you closer to? East, Central, or Western venues? If you're so bad, I'm sure you will walk away with something more than bruised pride on your first attempt...