1UZ injector question

[kingmick]

I wonder which point he objected to.

If its the G versus F code thing then I would have to agree with JASPER.

the iuz setup is different from say a 4cyl camry or rolla f series setup!
Same as you can throw a multi throttlebody and aftermarket computer at a 1uz and have around 320hp with ease, you dont get the same gains from other f series engines{per there capacity} now do you!

That crap would have been fine with a 4afe or camry engine but not relevent to the 1uz at all and throwing injectors at something that is atmo and not trimming for what is needed is a waste of energy! atmo engines dont like rich to make power!

[Jasper]

I think the 1UZ is about 22deg. 7M is around twice that IIRC.

[kingmick]

your saying the 7m is 44deg! look at what angles are used with pushrod,semi pushrod and overhead cam with buckets, it will help you understand how the chamber has to work with what the setup is and what is the best.

[ed]

rightyho - Jasper, give us a resaon why wide angle = performance

almost every race engine these days has migrated to a narrower valve angle. pulling an analogy to the 7m valve angle isnt helping you.

[amichie]

rightyho - Jasper, give us a resaon why wide angle = performance

almost every race engine these days has migrated to a narrower valve angle. pulling an analogy to the 7m valve angle isnt helping you.

Wow!!

This is a nice hot debate.

The larger the valve angle the larger the valves can be fitted. Simple trigonometry learnt by engine designers close to a century ago.

[kingmick]

current rac engines are around 11-12deg, to give you a hint jasper!

[kingmick]

Wow!!

This is a nice hot debate.

The larger the valve angle the larger the valves can be fitted. Simple trigonometry learnt engine designers close to a century ago.

more crap, you need the chamber area to fit the bigger valves!

[amichie]

more crap, you need the chamber area to fit the bigger valves!

Think about it dude!!!

Increase the angle and you get more area for the same bore diamater.

[kingmick]

what do you do about the lift you cant use! i dont think you have looked into this much! No point in having bigger valves if they dont fill the chamber as well as they can with better angle,right size and lift.

[amichie]

what do you do about the lift you cant use!

This is where the trade off begins.

Now you need to think about valve overlap.

Lift is only restricted with high valve overlap.

[kingmick]

and more angle

[ed]

and piston clearance

suggest some peeps go read about the new head designs from any leading race engine design group...

and how does this factor into why the 7m has marginally bigger injectors than the stock 1uz? come on! theres 400 different better reasons than fricken valve angle! lol... and you still dont have port flow figures to back up a cent of your basic argument anyway.

*waiting for this thread to get on some kind of track before it gets locked...*

[kingmick]

as a non overhead cam example, heads that i use and have for years in racing with chevs have gone from 23deg heads to 18 deg heads to the current 11-12 deg heads and a huge amounf more lift and ramping from roller cams.
It all comes down to chamber filling!

[Jasper]

Gosh, this has stirred up a can of worms!

This thread started out comparing the 1UZ and 7M, not the latest racing engines. All other things being equal, wider valve angles give better flow through the ports. They aren't so flash for squish and tumble, but that is not really relevant to the question which started this thread.

Also note that 'performance' and 'economy' were in quotation marks. I could have gone into alot more detail, but it didn't seem warranted at that point.

[millsi]

Millsi, why dont you use the 440cc/min injectors from the 7MGTE?

the 7mgte have a different resistance, and a different clip type. plus 7mge injectors can be had cheap and will supply enough fuel for my application

read about it here
http://www.lextreme.com/R&D%20Injector.htm