[Brett]

Why doesn't it have any advantages making everything smooth? Just curious, can't say I know much on the physics of this stuff

At a given speed centrifugal pump has a pump curve - at high flow the pressure is at the lower end of the curve. As you limit flow, the pump delivers more pressure to meet that resistance - lower flow > higher pressure available. (BTW if you do change the speed of the pump, it then operates on a different curve, same shape, just slightly higher on the page).

A positive displacement pump delivers only one flow at a given speed. If the system can take all of that flow, there there is no pressure. If you limit the flow to less that the delivery (and lets ignore the relief valve for now) then the pressure will spike straight up higher and higher till something breaks. That is why there is a relief valve.

The two curves look something like this simplified sketch:

Best one I could find on the net right now, but for the purposes of a worked example, with the above centrifugal system, if you can reduce friction (by porting the flow channels) from say 80 to 75 ft, the flow is going to go up from *holds thumb up to screen* say 60 to 80 cfm. In the same example on the blue curve, you can reduce the system resistance from 80 to 75 ft or jack it up to 200ft the flow is... 75cfm. That's it.

So smoothing the edges of the oil ways will flow more oil by one small fraction of a percent. I'm not saying don't do it, just saying don't bother.

(-8

 

[Tian90crx]

To be honest it came from the crappy y8 galleries, then everyone just started doing it to their d series and now like you said it became apparent on every single engine lol...

Sent from my PC36100 using Tapatalk 2

 

[ohisofly]

Thank you for the detailed response, I really appreciate it when people spread good knowledge that they can back up. Figure I'll try to post up some pics right now

Here's where the block is messed up. The mount hole towards the bottom looks like it had a bigger size bolt used so I'll probably get a 12x1.25 helicoil and either do the same or just tap the hole that was welded, open to suggestions

 

[As I Conspire]

tip for you, coming from a machinist

if you want the hole as straight as possible without a mill then your going to need to get a "stub length" drill, they have VERY little flex in them and wont wiggle when your trying to drill, the helicoils will work fine for what you are doing as long as the weld is strong.

but if you use a typical "jobbers length" drill they will flex, and the hole will be off center

 

[ohisofly]

8)

It's the little things that count :lol:

Matches the valve cover pretty good. You can see in previous pics I have generic blue painted oil cap, going to sand it down and paint with this purple paint which looks like an almost exact match

Blox oil and tranny magnetic drain bolts because I think I'm a baller

Bottom is the eBay gasket kit

 

[ohisofly]

After getting the block welded put it on the honing machine

Took out the main oil plug in the block and found this behind it :lol:

I'll probably try to get this bearing thing sorted out tonight, that's all for today

 

[As I Conspire]

beat me too it. now chamfer the hole lol it makes hand tapping SOO much easier, and use a tapping block to keep it straight. just a block with a hole slightly larger than the tap to keep it straight why you get it started.

 

[ohisofly]

I'll keep that in mind, need to find a place that has that specific helicoil or find one online. I was going to just use the old mount as a guide when tapping

 

[As I Conspire]

the old mount should work perfectly.

check this out when you get time

mcmastercarr.com
part#: 91732A827

you will still need a tap for it though, they will have one on that site. also. no need to buy a helicoil wrench, just cut a slot into an old screwdriver.

 

[ohisofly]

Thanks for the info, I'll take a look at that in a minute. Looks like I might have been better off finding another block or letting the machining guys at school do it :shock: oh well :lol:

 

[ohisofly]

Can anyone confirm that this chunk out of the intake manifold is supposed to be there? Cleaned up intake manifold and throttle body before putting them together

Cleaned the iacv

B18 & F22 getting put back together

Stock rod bolts

Bye bye

Stretching the arp rod bolts

All done

Head together

Purple cam seal is going to look dirty b

 

[As I Conspire]

dont have to much longer in class now do you?

 

[ohisofly]

Nope done with class now, working full time to fund this thing :lol: 7:30-6 shifts get old but it's for a good cause. The more I look at things I start to wonder if I'll have enough to turbo this thing before the summer is over, guess we'll find out :dizzy: These pics were from last week but I didn't have a chance to upload them because of finals

Here's pics of the oil pump porting, before

After

 

[ohisofly]

Here's everything right before I had fun throwing it all in my car

Bye bye college - it was not a comfy ride home :lol:

 

[As I Conspire]

last year at college as well? i know how it feels man but congrats!!!

3 more days to my graduation. WOO

 

[ohisofly]

I wish this was my last year :lol: it could be but I'm doing another 2 years for automotive management ( 1 1/2 years at school then my final project for the last semester from home). Congrats on graduation man!!! It isn't easy that's for sure

 

[As I Conspire]

oh and here i thought we went in and got out at the same time. well best of luck man.

 

[Tian90crx]

Nope, you're missing a chunk of IM,
just port it if all else fails lol.

 

[crxvtec91]

Damnit I still got time to go before I finish my MS :lol:

 

[ohisofly]

oh and here i thought we went in and got out at the same time. well best of luck man.

Thanks man best of luck to you as well, have a job lined up?

Nope, you're missing a chunk of IM,
just port it if all else fails lol.

Crap, guess I'll look at my current one once I pull the engine and hope it looks better :lol: It definitely doesn't look like it chipped off though, looks like it is supposed to be there

Damnit I still got time to go before I finish my MS :lol:

Never too late right :lol:

Can someone identify this trans & recommend a clutch/flywheel/pressure plate setup