Welcome to the SR20 Community Forum - The Dash.
Register
SR20 forum logo

Thread: Plans for High CR VE build

+ Reply To Thread
Posts: 51-60 of 79
2009-01-09 03:19:42
#51
it is not flow that is the problem per say. the factory manfold WILL not do.
and also the same thing that some have seen with the factory manifold can be attributed to the n1, the runners do not flow equally, number 4 is the culprit, to get it to do well requires alot of time, which means alot of money.
2009-01-09 03:25:38
#52
Ive already posted a dyno that showed static air intake flow on a ported factory manifold at 7k rpm for a 2.2L VE.

You literally cannot get enough air in to make power. Since i switched to MAP sensor the AEM clearly shows what the dyno reflects.

It's not valve float, it's not the header, it could be the head but there are also dynos of IM's that have been modified by mr freak that show power made on a stock 20ve with boltons carries out further than a stock IM.

Again, like i said you cannot reproduce 20v results on a 20ve or 16ve. I don't understand why a 20v is in this conversation. The 20v is the closest thing to Nissan actually building a 2.0L VE with the express purpose of it being a 2.0L VE.

Miko and Charles both know in much more detail than i do because I don't care about the 20v. Im not going to find one, buy one, modify one or try to make more power on one. I will also be daring and say that available mod for mod a 20ve will make more power than a 20v (n/a of course).

yeah i went there
2009-01-09 03:48:01
#53
Off topic
2009-01-09 03:54:59
#54
Originally Posted by donttazmebro


It's not valve float, it's not the header, it could be the head but there are also dynos of IM's that have been modified by mr freak that show power made on a stock 20ve with boltons carries out further than a stock IM.


Miko and Charles both know in much more detail than i do because I don't care about the 20v. Im not going to find one, buy one, modify one or try to make more power on one. I will also be daring and say that available mod for mod a 20ve will make more power than a 20v (n/a of course).

yeah i went there


this part is a bolton 2.0L that showed a freak modified IM carried more power further on the dyno than the stock intake manifold

2.0L 86x86 1998cc SR20VE
2009-01-09 03:57:36
#55
i also have a dyno that shows a custom im making more power then the stock. and there is nothing special about it, its not even built right, its too short and has a huge plenum, but aparently its better then stock
2009-01-09 04:09:23
#56
Originally Posted by donttazmebro
if he had an IM he would have said it. I do know that if you are going N/A there aren't any cams that are going to do much on a stock head or even a head with port work. I also know that a stock 20ve bottom end is completely fine for the limitations of every other N/A performance part he wants to add.

people make motor builds more complicated than they have to be buy a 20ve and add the bolt-ons call it a day...nice and reliable. If you want to throw money at something the bottom end (stock bore) isn't where you need to put your energy.

My opinion of course


Which is exactly what I've done, and for the same reason. RELIABILITY!

I spent a LOT on my last SR20VE disaster (in fact more than my ENTIRE new car), and HUUUGE mistake of an engine. Which WAS meant to be the 'all-killing-monster'; well it DID kill my bank balance, and consistantly under-achieve on the dyno, and road, which did kill my confidence, and was a gas guzzling monster. So it did kinda work... HAHAHHAHAH!

It was WAAAAAAAAAAY over-engineered, yet under-engineered, and used old World technology by people that really should have tried to keep me in the 20th Century; not plunging the extensive Nissan R&D back 25years into the pushrod era; as this engine builder did.

Hence I tried it from a different angle; shame it cost me SOOOO damn much to learn this.

Over here (in New Zealand) I NOW have the most powerfull N/A SR20VE, with around 140kW at the wheels, and a wide torque band; didn't take too much to acheive.

Started with a STANDARD SR20VE bottom end UNTOUCHED!

There are plenty of people over-complicating their builds here, and I was almost 20kW at the wheels more than most of these people.
One guy has even spent well over $ 10k, and two-years of build time with surprisingly, and upsettingly dissapointingly, average results.
I'll use his engine as a close reference as we both use the same gearbox, and ECU (Daughter Board), he may even have the same extractors(?); many of the others used the same ECU, but different gearboxes.

I suppose what I'm trying to say here is that I know what it's like to spend the $$$$, and do TOO much, with the results being below par.

If it's any help my old 'all-killing-monster' netted FOUR, yes, 4 more kW at the wheels, than the standard SR20VE engine did STOCK STANDARD internals and even SR20VE cams! Not EXACTLY what I was expecting...
2009-01-09 21:06:54
#57
Originally Posted by snickers
As i have said before not all VE heads are equal. the earlier castings are better than the later ones. I have flowed several stock VE heads and they range from 238cfm @ .500" lift to 277 @ .500" lift. BONE STOCK. This all depends on the port transition from before the divider to the valve seat and into the combustion chamber.

The factory intake manifold by itself may flow more than the cylinder head ( which it does) but because the port entry from the plenum is smaller than the outlet at the cylinder head mating surface, there is a reverse taper which means the air slows down and the pressure in the intake runners becomes less than atmospheric. When you bolt a factory intake manifold to a GOOD ve cylinder head and flow it, it drops by about 45cfm. A head that flows 277 @ .500" without the intake flows 233 @ .500" with the intake manifold and T/B with velocity stack. This is not theory, this is a fact.

The 20v intake ports do have a higher roof and they are narrower slightly than a std VE head. the 20v head does have slightly higher flow through about .400" lift then the std head takes over. the 20v intake with the longer divider does help velocity through the midrange lift points which helps power at those flow/power levels.

To get the correct resonant length from a stock sr20ve intake manifold for 8000rpm you need to add 30mm to the runner length.



interesting...
2009-01-09 21:07:36
#58
Originally Posted by cory
i also have a dyno that shows a custom im making more power then the stock. and there is nothing special about it, its not even built right, its too short and has a huge plenum, but aparently its better then stock


proof!
2009-01-09 21:09:26
#59
Originally Posted by donttazmebro
Ive already posted a dyno that showed static air intake flow on a ported factory manifold at 7k rpm for a 2.2L VE.

You literally cannot get enough air in to make power. Since i switched to MAP sensor the AEM clearly shows what the dyno reflects.

It's not valve float, it's not the header, it could be the head but there are also dynos of IM's that have been modified by mr freak that show power made on a stock 20ve with boltons carries out further than a stock IM.

Again, like i said you cannot reproduce 20v results on a 20ve or 16ve. I don't understand why a 20v is in this conversation. The 20v is the closest thing to Nissan actually building a 2.0L VE with the express purpose of it being a 2.0L VE.

Miko and Charles both know in much more detail than i do because I don't care about the 20v. Im not going to find one, buy one, modify one or try to make more power on one. I will also be daring and say that available mod for mod a 20ve will make more power than a 20v (n/a of course).
yeah i went there


naaaahhhh,
2009-01-09 21:14:40
#60
^Wow. He went there.
+ Reply To Thread
  • [Type to search users.]
  • Quick Reply
    Thread Information
    There are currently ? users browsing this thread. (? members & ? guests)
    StubUserName

    Back to top