NA Tech Race to 100whp per 1000cc's

[Tom03es]

look for alejo_nin , he lives near me , and has a write up on the manifold , sure he would not mind a few questians from you , and the manifold year should be a 2000

He got a '97 manifold.

Somewhere in the middle of 7 pages (of 40 posts per page) he ran into some troubles but finally got them figured out..... I think.

 

[mazdaspeed777]

I hear that. Does anyone know which years of 626 manifold will work? I believe all the manifolds will bolt up, but issues with the pre-2001 manifold arise in terms of fuel rails and such.

I have been told to use the ones from 2000-2002. The one I got is from Protege Garage so not sure what year they sell.

 

[Tom03es]

Decking the head

OK, I've been thinking...... which is dangerous.....

Is decking the head (milling off a little bit of the cylinder head to increase compression) worthwhile? If so, how much can you mill off? Is the decreased height negligable concerning the timing belt- can the tensioner take up the slack?

 

[LordWorm]

OK, I've been thinking...... which is dangerous.....

Is decking the head (milling off a little bit of the cylinder head to increase compression) worthwhile? If so, how much can you mill off? Is the decreased height negligable concerning the timing belt- can the tensioner take up the slack?

you can do that to pick up a very small amount of additional compression.... how much you can take off I don't know..but there are formulas and calculators for calculating compression by changing deck height.

Really though i'd be surprised if you went up a few tenths.... better off changing to higher comp pistons.

 

[Tom03es]

Well, what I was thinking was what if I picked up a spare cylinder head. Get it checked out by a shop to make sure it's good. Get it decked- even if only slightly. Port out the openings a little bit- gasket match maybe... Assemble the head with new cams and lifters. And then drop the new head on with the addition of a single runner intake.

Just a thought.....

 

[LordWorm]

Well, what I was thinking was what if I picked up a spare cylinder head. Get it checked out by a shop to make sure it's good. Get it decked- even if only slightly. Port out the openings a little bit- gasket match maybe... Assemble the head with new cams and lifters. And then drop the new head on with the addition of a single runner intake.

Just a thought.....

that'll work...wont get you near 100whp/L though.....
still, if you have a spare head and can get the work done cheaply, go for it...

 

[Tom03es]

Even though I post in this thread, I really don't think I'll ever take a serious stab at the 100whp/liter goal. 130-150whp total would be fine with me.

 

[jimmysuite]

roll call! I'm planning on eeking out as much as I can with my current setup before undertaking build#2

 

[LordWorm]

roll call! I'm planning on eeking out as much as I can with my current setup before undertaking build#2

Sounds like a plan!

you can actually continue on your current build, with parts you need for the new build. If you go for a header designed to run optimum on your new setup, it will be sub par for your current one, but still better than what you've got, and it saves you opening your wallet twice (a header good for 7500rpm, is going to be somewhat different to one good for 8500rpm...runner lengths will be tuned differently and so forth). Same goes for a custom sheet metal intake manifold, which will unlock plenty of potential in the motor, and hopefully let the head do what it was machined to do - flow better (i'd say the bottle neck on the intake side is still going to be the IM, even with a 626 IM).

Cam gears, more aggression on the timing, bit more RPM, and so on, you'll push that engine pretty far - then its just a case of getting the engine spinning fast enough, flowing well enough, with high enough compression and you'll have a monster (i.e. engine #2)


as for me.....maybe i'll darkside it
haha

 

[jimmysuite]

as for me.....maybe i'll darkside it
haha

NOOOOOOOOO! dont even joke like that man.

Actually, I have thought about what a small turbo would be like on a forged FSDE w/ ~10-11:1 CR

You think you could run 5psi safely with that kind of compression?

 

[LordWorm]

NOOOOOOOOO! dont even joke like that man.

Actually, I have thought about what a small turbo would be like on a forged FSDE w/ ~10-11:1 CR

You think you could run 5psi safely with that kind of compression?

rods might have a hissy fit... but think about the kind of compression lots of FACTORY turbo motors are running these days... if you can get the tune safe, i can't see why not.

i wouldn't though... you've built this motor (and more so the next motor) with NA in mind from the outset...its not going to necessarily transfer nicely over to FI.. If you do get the racing bug though, a nice small shot of happy gas in either motor, with cams dialed in appropriately would be beneficial on the quartermile.

Obviously once number 2 engine is built, you're going to have number 1 engine and no car to put it in... thick head gasket/decompression plate, and drop it into something small and light weight (like a BF 323), with a small turbo, and you'd have a death trap

 

[jimmysuite]

LW - So you're seriously considering FI not caused by custom ram pipe connected custom IM on a head with tons of flow bench time slapped on a block with a forged lightweight high compression drive train??????

 

[LordWorm]

LW - So you're seriously considering FI not caused by custom ram pipe connected custom IM on a head with tons of flow bench time slapped on a block with a forged lightweight high compression drive train??????

Noone knows what i'm considering - gotta keep you jokers guessing!

I do love high revving NA motors though..... nothing sounds better than an engine running on a knifes edge of flying apart.


****BUT****
I have tentative approval from the wife on the spare engine - should be here by weeks end - already sold the head and rocker cover off it... theres a set of JDM cams that can be sold, along with the set of JDM cams i've already got in the garage...wonder what other goodies i'll get ......
hrmm

 

[khaosman]

Smaller turbo than the stock MSP turbo? Only a real life snail would be smaller

 

[Sleepy]

I would guess a bit bigger than that. Wouldn't the GT2554R run out of flow at the power he's looking for?

 

[LordWorm]

I would guess a bit bigger than that. Wouldn't the GT2554R run out of flow at the power he's looking for?

dunno whos looking for what...but hte point is at massively high compression, with a turbo on the stock rods like what jimmy is running, even a SMALL amount of boost would be somewhat dangerous.

 

[jimmysuite]

NOOOOOOOOO! dont even joke like that man.

Actually, I have thought about what a small turbo would be like on a forged FSDE w/ ~10-11:1 CR

You think you could run 5psi safely with that kind of compression?

dunno whos looking for what...but hte point is at massively high compression, with a turbo on the stock rods like what jimmy is running, even a SMALL amount of boost would be somewhat dangerous.

Notice bold 'Forged' above. The setup would probably be pretty sweet. No turbo lag while waiting for turbo to spool.

 

[LordWorm]

Notice bold 'Forged' above. The setup would probably be pretty sweet. No turbo lag while waiting for turbo to spool.

outright power may be an issue..
the reason why guy's making big power on unleaded gas decompress the motor is that sacrificing some compression to resist detonation and run more boost is conducive to making masses of power.

Methanol on the other hand will lap up giant gobs of compression with masses of boost and be safe as houses.

put simply, if you're staying with garden variety fuel, you'll make more power with less stress on the engine by running low compression.

 

[jimmysuite]

I guess I was just thinking:

-low compression, high boost has it pros and cons

-high(er) compression, low to med boost would have a entirely different set of pros and cons

but this is the NA section so lets get back to what really matters....

NO FI

 

[Antoine]

(bump) for new year updates! (drive)