Tag Archives: head

A12GX Head – A14 Sub – Dual SU's – Lightened Flywheel

June 4, 2009 Herman Mathee Leave a comment

What a busy few weeks getting the Bakkie in order.

Just want to give all that provided me with tips and tricks some feedback.
Got the Datsun

Comps spec on the flywheel, took the flywheel and a new pressure plate to the dude that does my machining, he got it down to 5.78kg, he also balanced the flywheel and new pressure plate for me.
Installed the A12GX head with worked ports and valves.
Fitted a 4-1 branch manifold, already had a 50mm Stainless Free flow System
HS4 Dual SU Carburetors, intake manifold ports matched to head intake ports
Fitted a electric fan, switch comes on at 85degrees, removed mechanical fan on water pump
Had to purchase a new Temp Sensor, could not get the old one out of the A14 head.

Here comes the interesting bit, somewhere down the line, they changed the resistance on these sensors, from about 560ohm to about 360ohm at 16degrees.
This caused more than enough problems. All of a sudden the temp gauge needle climbed way more that it should.

We started it up, all was fine, no bolts, pistons or valves flew around, tuned the su’s. The electronic fan came on, everything working as it should.

Once on the road it was a different story, torque there is a lot of, it is clean, revs up nicely, pulls excellent from 2k rpm right thru to the limiter (currently at 7k rpm), there is not even signs that you are about to hit the limiter, this means all is working together, producing nice bottom down torque and decent top end power.

Then, all of a sudden the motor gets hot. After a day or two and enough swear words to make a sailor look like a beginner. We figured it out. Once on the road there is enough air travelling over the switch to cool it down and not switch the fan on. This caused me more time under the bonnet than needed.

Obviously if the water gets way to hot, pressure builds

and want to escape somewhere, the place it picked was between cylinder 3 and 4 at the water ports on the intake manifold gasket. After taking it apart, I also noticed that the one exhaust manifold washer was pressing against a piece of welding on the branch. Smoothed it down, reassembled the lot. Also re-fitted the old mechanical fan on the water pump to be on the safe side.

Took it for a drive, no issues what so ever anymore, the fan doesn’t even switch on after some heavy spinning and gymkhana practice.

Saturday we have our next race meeting and look forward to the added power and overall better A14-A12 inbreed.
Just hope I will be able to keep the wheel spin to a minimum, we are expecting rain also, and that sure as hell wil not help.

Thanks a lot to all that helped and gave advice. Special thanks to Einstein(My Brother), My Father and Ruan.

modifications

Datsun Head Prep & Engine Mounts

May 20, 2009 Herman Mathee 2 Comments

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=core.DownloadItem&g2_itemId=607&g2_GALLERYSID=TMP_SESSION_ID_DI_NOISSES_PMT” alt=”A12GXHeadSkimmed2″ width=”466″ height=”350″ />Look at it,isn’t she just beautiful. All shinny and almost completely assembled. With ports so big and smooth…….. almost got sidetracked there.

Received her back yesterday from the machining shop after a very gentle skimming job just to make sure all is in good

order and ready viagra for sale for some serious hard work and alot of abuse on the gymkhana tracks. The only thing that is still in the back of my head is the water ports that show signs of damage, but at least this was approved by my father that has a lot more experience than me. Just need a final cleanup after the machining and the last few parts must be prepped before we can start with the rebirth of the A12GX head on the A14. What a nice combination these to will be, coupled that with the pare of SU’s waiting there turn. A nice change from the standard DCOE route in SA. Hopefully tonight the installation can commence.

Last night Ruan and I installed the new set of engine mountings, the old ones started tearing, so we upgraded them to some serious mounts. This stuff is so tough, I wonder if it wasn’t made for V6 or V8 engines. Lets see if the poor 1400 can tear them this round.

Luckily for us, half of the engine bay is stripped, to get a grinder in next to the dizzy and the strut tower is a task of immense struggle. After a hour or two, both mountings was in place and a set of happy eyes starred them down.

My brother and I also finished with the CAD drawings for the Camber/Castor plates. We printed them, took a pair of scissors to it and trial fitted it to make sure the new wholes will be in usable spots. On the Datsun it was a success, let’s hope the same for the Escorts side. Then we can get the first sets lazercutted and assembled.

modifications

Dual SU Carbs

April 8, 2009 Herman Mathee 3 Comments

Just a quick heads up on the Head and Carbs for the Datsun.

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/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=332&g2_GALLERYSID=403cf6ce8cc6eb157f4bf9fc96e3e418″ alt=”SUs Stripped” width=”576″ height=”432″ />

The A12GX head is all cleaned up. After a 2 day long cleanup session, everything is ready for

fitment.
Ports is as clean as I can get them, gasket areas are shinning and ready for some new ones. The valves Seats are grind.
Yesterday, me and my brother prepped all the clean parts and reassembled the head. It is know wrapped and waiting for an installation date after the 2nd May 2009. We have a month gab between gymkhanas after the 2nd, so this will be the ideal time to install all these parts and eliminate all problems.

The HS4 SU Carburetors have been stripped and checked; so far I can so no damage to the parts. No cracks, holes or excessive wear. The next steps will be to get this all cleaned up for further inspection and reassemble them. Then they can also move next to the head on the shelf for installation.

This is killing me, knowing I sit with all these parts and have to wait to get them installed, o well; at least it gives me time to get everything ready.

Electric fan must be installed and wired up, the

brackets for the helper leaves on the back suspension need to be made and tested. Hope this stiffens it up nicely, could be a cheap mod for starters to the back suspension. The branch must be sources and wrapped with Heat Wrap, and let no one tell you different, this exhaust wrap is expensive, R450 for a 15m roll, just enough for a 4 cylinder branch.

I’ll be off to go pull some more hair, this waiting is killing me.

modifications

Datsun A12GX Head &amp; Dual SU Carb Project Started

April 6, 2009 Herman Mathee 8 Comments

Last weekend, after my official duties online viagra at the Toyota Dealership Rally out in Caledon where finished, I decided to drive to my parents in Doornrivier for a visit and to get my little hands on some old Datsun parts.

One of the best decisions in a long time. It took me back a few years when my brother used to

tinker with these little motors. These parts is almost like family treasures, as a lot of it came from my dad that also used to play with Datsun engines.

The idea of this project is to get these parts all cleaned up, assembled and installed on the bakkie, if memory serves correct there will be no need for mayor structural changes to the parts as A12-A14 engines are very interchangeable. The head was first on a A12 and later on a A14 that seized two pistons due to, to much compression and running on normal 97 octane fuel (back in the day of 97 octane in SA).

The motor where rebuild and a spacer where added between the bottom end and head to drop the compression enough. This engine had a lot of torque and also very responsive.

The Head:

A12 GX Head
A14 Intake and Exhaust Valves
3 Angle Valve Seats
Double Valve Springs
Ported

The Carbs:

Dual SU something something carbs ( will get numbers )
Ported Intake to match the Head
Custom Air Filter Housing

Johan (friend) started yesterday stripping the parts and the huge cleanup process. To my amazement the valves came out much easier than expected. I thought these double valve springs are going to require some serious fore arm strength, a knock with a hammer on the valve spring retainer was all that where needed, but still far more difficult than a head with only one set of valve springs.

Later on Ruan joined me, we had a long discussion around the SU carbs as they are fairly new to him, my knowledge on them is also quiet limited, thus it took some time explaining the operation of these carburetors. For more information regarding SU Carburetors, visit Wikipedia

The idea is to get all planned and assembled before 2 May 2009, after the 2nd May we want to start bolting these beauties to the bakkie, in the whole process I also want to swop the flywheel out for one that is lightened and replace the stock clutch and pressure plate with a Datsun Pulsar unit, these are larger and still just a bolt on. The other modifications that will be done at the same time is the fitment of a electric fan and a 4 into 1 branch exhaust manifold.

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Tag Archives: head

A12GX Head – A14 Sub – Dual SU's – Lightened Flywheel

Datsun Head Prep & Engine Mounts

Dual SU Carbs

Datsun A12GX Head &amp; Dual SU Carb Project Started

Mathee Auto Developments