ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Talk about your project car here

Re: ZeroDrift's 1988 All Trac. Anyone have a replacement bl

Postby underscore » Mon Feb 04, 2013 2:00 am

pneumatic TVIS control? Is that to replace a damaged diaphragm?
Members don't see the above ad. Register now - it's free!
★ 1991 GTFour RC ~ "Rebel Scum" ★
It's for sale! http://www.alltrac.net/phpBB2/viewtopic.php?f=64&t=52181
Build thread http://www.alltrac.net/phpBB2/viewtopic.php?f=44&t=44216
underscore
GTFour God
 
Posts: 3809
Images: 0
Joined: Mon Apr 09, 2007 11:29 pm
Location: Kelowna, BC

Re: ZeroDrift's 1988 All Trac. Anyone have a replacement bl

Postby ZeroDrift » Mon Feb 04, 2013 2:10 am

That is the plan. I will be doing some tests on this before any bracket designs though. Have to make sure everything will work with current vacuum levels.
ZeroDrift
Club Member
 
Posts: 436
Joined: Tue Feb 16, 2010 4:18 pm
Location: Colorado

1988 Toyota Celica

Re: ZeroDrift's 1988 All Trac. Anyone have a replacement bl

Postby UtahSleeper » Fri Feb 22, 2013 7:36 pm

So, any progress on the MS install?
80 Corolla Hatchback - Power (In Progress) http://www.3tcgarage.com/viewtopic.php?f=23&t=3208
88 Alltrac - Snow (Waiting for the garage) http://www.alltrac.net/phpBB2/viewtopic.php?f=44&t=43482

Cardomain - http://www.cardomain.com/id/chris52580
User avatar
UtahSleeper
Established Member
 
Posts: 1917
Joined: Thu Feb 01, 2007 6:00 pm
Location: Magna, UT

Re: ZeroDrift's 1988 All Trac. Anyone have a replacement bl

Postby ZeroDrift » Fri Feb 22, 2013 9:15 pm

No major progress on the car. Been too busy to put any major time into it. I have the head here and I'm going to clean up the ports lightly and will be ceramic coating it, along with the turbo in the next week or two. At this moment I'm putting my time into my business and setting up the new computer controlled oven which will enable me to ceramic coat heads and other large/sensitive parts in a very controlled environment.

In the mean time, what are these: (Fuel injector resistor pack?)
Image

Along the firewall:
Image
ZeroDrift
Club Member
 
Posts: 436
Joined: Tue Feb 16, 2010 4:18 pm
Location: Colorado

1988 Toyota Celica

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby MWP » Sat Feb 23, 2013 2:10 am

First photo looks like fuel pump resistor.
Second is injector resistor pack.

Can tell the difference by the number of wires going into them.
My collection of GT4 documentation: http://gt4.mwp.id.au
Daily: Celica GT4 ST185 (~170kw/atw)
Project: Toyota RA28 '77 Celica (1UZ-FE powered)
Chairman of the SA Classic Celica Club.
MWP
Established Member
 
Posts: 1591
Joined: Mon Jun 01, 2009 11:02 am
Location: Adelaide, South Australia

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby ZeroDrift » Sun Feb 24, 2013 6:29 pm

Thank you for the info! I'll have to check out the wiring on that and report back.

Here are a few pictures of the small bit of porting I've done. Honestly just cleaning up edges and allowing for a smoother transition.

Intake manifold now matches the TVIS nicely. Just need to put a radius on the TVIS edges that face the manifold now, and the intake will be completed.

Image

Image

Image

Now that I think about it I will need to work on the throttle body side of things slightly more. Gotta get the future IAT port sorted out still.

As for the head, I have a question regarding the exhaust ports. I'll be opting for the stock exhaust manifold for the foreseeable future. Going to be porting the exhaust manifold near the merging section before I apply the ceramic coating. The head's exhaust ports are considerably smaller than the exhaust manifold: is there any benifit to match the ports to the manifold, or will a small 'lip' add some benefit?

Image
ZeroDrift
Club Member
 
Posts: 436
Joined: Tue Feb 16, 2010 4:18 pm
Location: Colorado

1988 Toyota Celica

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby ZeroDrift » Tue Feb 26, 2013 12:06 am

What I'll be doing to the TVIS plates to aid with a smooth airflow into the engine.

From this:
Image

To this:
Image

Image

Will be using a flapper wheel to do the final smoothing.
ZeroDrift
Club Member
 
Posts: 436
Joined: Tue Feb 16, 2010 4:18 pm
Location: Colorado

1988 Toyota Celica

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby RallyMax165 » Tue Feb 26, 2013 6:16 am

Thank you good sir,
What a fine job of documentation you have done, and fact gathering as well. I sincerely applaud your efforts to get to the bottom of things. Bravo.
I also have an ST165 as well and I am just starting to turn it from a possession into a project car. We should keep in touch for sure, I will be watching this thread. Can't wait to see that baby rocking those sweet ass new wheels! I like the vent look, but understand it might not be an efficient solution. I plan on driving my car through the northern Nevada Desert a lot this summer and so this heat issue has already come to my attention through my research... How much money in gold heat insulation would you say you have on your 'Trac? I am planning on doing a large wide center evacuation duct in the hood, in between the radiator and the turbo. I also am working on a straight short ram intake because the stock one on my car is falling apart. I am vacillating over how, where or if to make an intake through the body panels for some cold air.
I don't mean to hijack your thread, I am just excited to see such intimate details about the same car I have!
-Max
RallyMax165
Club Member
 
Posts: 39
Images: 22
Joined: Wed May 16, 2012 7:38 pm
Location: South Lake tahoe, CA

1988 Toyota Celica

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby RallyMax165 » Tue Feb 26, 2013 7:38 am

It's hard to find a really good article on the subject of cylinder head dynamics, but here is a decent summary. Turbo handles volume, the engine wants velocity. Keep them small, straight and unhindered ... I am cautioning you because I got carried away once, on a small block Mopar V8 in my 67 Dart GT, I afterwards researched it heavily and regretted removing as much material as I did from the intake side because it took away a BUNCH of low end torque.
Faster intake runners give you more low-end torque and more volume gives you higher flow potential and if the cam and valves are also conducive to tremendous flow, you'd better build a light and high-sprung valve-train that can scream up to 10,000RPM because you built a banshee.
Think of the airflow improvement of a golf ball's divets, the stock casting has divets, why go smoothing out those blessings in disguise. If you are serious about making a super fun street car, get some cams, have a turbo manifold built for a turbo of your choice for this application, and don't worry about the ports.
The best thing that an amateur hobbyist to a head is relieve some of the "Squelch" material. That is any area in the combustion chamber which restricts the gas' mixture from the valve openings from entering the cylinder itself, it also allows the ignition spark to penetrate the entire combustion chamber more rapidly. Most 4 valve per cylinder cars don't have much issue here though. (Semi-HEMIspherical combustion chambers do this VERY well) Squelch work becomes especially important when running domed pistons (For mostly non-turbo applications).
Having the base of the head "decked" or machined down will decrease the combustion chamber's size and therefore increasing the compression ratio of the piston's stroke into the Fuel/Oxygen mixture. Decking heads may also cause valve and piston head interference as well when you add domed pistons and or camshafts that increase valve "lift" and intake "Overlap" (also for high RPM designed builds) so be carefully considering all of your operating interference tolerances when considering beneficial modifications to your car's valve head.
Many HP can be won or lost with appropriately placed funds at this point. And I wish you the best of luck in this endeavor. I can tell you want to build a driver's car here and not a race machine, so keep it simple and read up well. I can not yet give you firsthand trial and error advice on a Turbocharged 4-Valve Aluminum head so here are some other forum links on this matter:

http://www.superhonda.com/forum/f93/por ... es-127827/

http://www.mr2.com/forums/turbo-engine- ... ish-2.html
RallyMax165
Club Member
 
Posts: 39
Images: 22
Joined: Wed May 16, 2012 7:38 pm
Location: South Lake tahoe, CA

1988 Toyota Celica

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby ZeroDrift » Mon Mar 04, 2013 12:28 am

Decided to do a bt of work on the 'Trac today. Getting the head prepared...

Image

Image

Image

Image

Image

Image

Image

Image

The porting work is only a minor port match. They match the new gasket and the TVIS system very nicely. The chambers are not finished yet as they need a bit more attention before they are blasted in preparation of the ceramic coating.
ZeroDrift
Club Member
 
Posts: 436
Joined: Tue Feb 16, 2010 4:18 pm
Location: Colorado

1988 Toyota Celica

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby RallyMax165 » Mon Mar 04, 2013 1:30 am

It really does look like you are doing a top notch job there.
RallyMax165
Club Member
 
Posts: 39
Images: 22
Joined: Wed May 16, 2012 7:38 pm
Location: South Lake tahoe, CA

1988 Toyota Celica

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby MWP » Mon Mar 04, 2013 1:35 am

Hmmmm... :cry:

You should have done more reading about combustion chamber dynamics before starting.
Youve removed a decent amount of the squish areas. Youve probably made things worse, not better :(
Squish areas are very important for detonation resistance.
My collection of GT4 documentation: http://gt4.mwp.id.au
Daily: Celica GT4 ST185 (~170kw/atw)
Project: Toyota RA28 '77 Celica (1UZ-FE powered)
Chairman of the SA Classic Celica Club.
MWP
Established Member
 
Posts: 1591
Joined: Mon Jun 01, 2009 11:02 am
Location: Adelaide, South Australia

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby ZeroDrift » Mon Mar 04, 2013 1:58 am

MWP wrote:Hmmmm... :cry:

You should have done more reading about combustion chamber dynamics before starting.
Youve removed a decent amount of the squish areas. Youve probably made things worse, not better :(
Squish areas are very important for detonation resistance.



Pistons that I am using are much higher compression than stock. Spec is 9.5:1, which is just a pinch more than I was hoping for, so the minimal amount I'm removing from the combustion chambers should be a beneficial trade off. Plus I am removing sharp edges that will become hot spots, and one blasted, cleaned and ceramic coated will be very resistant to detonation. 8)
ZeroDrift
Club Member
 
Posts: 436
Joined: Tue Feb 16, 2010 4:18 pm
Location: Colorado

1988 Toyota Celica

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby MWP » Mon Mar 04, 2013 4:26 am

Well in that case you are removing it from the wrong areas.
There is nothing wrong with 9.5:1 CR anyway, its not that high (im at ~12:1).

How does coating prevent detonation exactly?
Coating helps with thermal efficiency, and not much else.
Coating, etc is no substitute for the squish areas.
Be careful not to remove any pressure recovery areas too.
My collection of GT4 documentation: http://gt4.mwp.id.au
Daily: Celica GT4 ST185 (~170kw/atw)
Project: Toyota RA28 '77 Celica (1UZ-FE powered)
Chairman of the SA Classic Celica Club.
MWP
Established Member
 
Posts: 1591
Joined: Mon Jun 01, 2009 11:02 am
Location: Adelaide, South Australia

Re: ZeroDrift's 1988 All Trac. Engine Overhaul Project!

Postby ZeroDrift » Mon Mar 04, 2013 5:15 am

MWP wrote:Well in that case you are removing it from the wrong areas.
There is nothing wrong with 9.5:1 CR anyway, its not that high (im at ~12:1).

How does coating prevent detonation exactly?
Coating helps with thermal efficiency, and not much else.
Coating, etc is no substitute for the squish areas.
Be careful not to remove any pressure recovery areas too.



The coating will reduce thermal buildup in the metal, and combined with a bit of shaving will aid in the reduction of hot spots from sharp edges. The amount of material removed is minimal, just enough to make it a smoother transition. Every build I do I inevitably make a few experimental changes to mix things up. Some work better than others, but at the end of the day it adds character and I'll still be readily able to reach my power goals.

If you want to see some of my past projects, here is my last build: http://www.rs25.com/forums/f145/t134896 ... 2-5rs.html
ZeroDrift
Club Member
 
Posts: 436
Joined: Tue Feb 16, 2010 4:18 pm
Location: Colorado

1988 Toyota Celica

PreviousNext

Return to My Project

Who is online

Users browsing this forum: Yahoo [Bot] and 1 guest

cron