wall of text warning...

Ive got 2 possible customers here with b122 that are interested
but wont part with their a15 engines yet are be willing to
build them into twin cam setups for themselves.

Japanese are quite pedantic like myself so Im looking at the
neatest most compact setup I can offer to them and myself.
Matt saying he can do it! yet I said the opposite since
Rob showed me he could'nt so I just accept that after
some brainstorming looking at the setup with him.

He is a clever dude even sold his past business to who
is now Les Collins another twin cam datsun hybrid dude.
However its been a while since then and Matt, a 3rd eye
on the subject has convinced me there is another way now.

So now see this common toyota industrial engine waterpump
also used by many cars like Taragos, Estima, Liteace, Townace,
crowns, Dyna, Hiace and Hilux etc. eg. cheap and common
and from a 1.8-2.2L OHV engine similar to the K or A series.

Eliminating a tensioner/idler pulley with this waterpump would
be just amazing and well worth the extra investment for me and
for the local guys here who love analog/carbs/metal etc.
The culture here is surprisingly very anti ecu in the tuning
circles of older datsuns and toyotas.

In your case Reubs were you are going delco (simple cheap and well
community supported) with turbo, e pump +more eg. pizza with the lot
but I have to be closer to my roots and stay with carbs, mechanical
waterpumps, just ignition ecu at most which will be more than my new
and latest dailys sport (Ive sold my last 3 ecu cars recently and
we now have 3 cars that run on carbies with e-ignitions at most yet
Im living in Japan!)

All 3 of the dailies achieve the same economy as the ecu versions
of the following years and everything after it!.
Great thing is these things are low mileage and are considered old
and dated here so win win for me, the obsolete tech freak.

Matt, bring on the inking or branding ideas when you have time :)

Quote:

The bush fits very well onto the crank, but it just slips on. No need to heat it up. No play, or anything untoward.

Since it is just a spacer, once it is pushed back by the pulley and the pulley is bolted correctly, it ain't going to move, and it doesn't hold any weight itself.
A grub screw would be nice (but prob unnecessary), but then you would need to balance that somehow.

Its all fine to adjust the original design, but only if it clearly makes for measurable benefit. We do need to remember that the existing design works, and works fine.

Quote:
The toyota water pump looks like it could be a great option. Small compact, and as long as its easy to get a hold of seems like a great way to go, but I personally would be loathe to get too carried away on that as again, the existing design works just fine.
Adding in the extra pulley means adjusting the belt route etc etc - I really need to get my car done!

But as an on-going development process, that is just ticking over, then yep- go for it.

I haven't gotten around to digitizing my logo or tattooing any parts yet.

Thanks Reubs prob Rob mentioned to you it needs to be heated before fitting
or it needs to be pressed in? that is strange otherwise.
What do you think of the toyota waterpump? its pretty compact vs A series.
It would look simpler all up if its suitable and blades face the correct way.
The only other thing I would like is CNC alloy tatoo on these things
like on the plate somewhere visible.

Maybe DATS*HOON , F`KING A or MEDUS*A (16 viper/valve headed A)

Quote:


The sleeve that sits on the datsun crank to push the Mazda pulley out is just steel. I think it was machined from some bar, but some suitable pipe would work also.
Now that I think about it, it should prob have a grub screw on it to hold it firm on the crank. It really just sits on there and it held in place y the crank bolt that holds the pulley on as well.



When I get home again, I can put the verniers on this and give you some measurements so that it can be added to the drawing repository.

Thats ok Matt will start with the B6 head first, I need to get one running
then will build my Z version as soon as I sort out the B first as I have
a few guys here that wont part with their A15 engines as they are so rare
but are interested in the twin cam conversion if I can get it running.

If you have time there and there after your current work Im looking at this
toyota 4y/4p waterpump which is common even from China. Just by looking at
first the measurements I found it should be a good indicator if its the pump
I should buy and send to you. It would need you to also fabricate a pulley
for it to cover the whole thing so the back of the timing belt can run on it.




Total height H 112mm
Length L: 96mm
Shaft diameter D1 15.9mm
Neck diameter D2 28.3mm
Diameter flange D3 67.7mm










https://www.aliexpress.com/item/32816285826.html

The upper left tab has to be modified for the Z5 cylinder head

Sounds good Matt, pls no rush Im still trying to secure a bottom end and
head locally but looks like I will have to go to the mainland.
The hassles of being in a small island but the Datsun twin cam spirit
will never die, even without a Datsun!

Reuby can you send me a pilot email to Mattndew02@yahoo.com, and Ill send my plate model over. Its all in imperial measurements now though.

D all the pacers can be machined from aluminum instead of steel if they are good slip fits and aren't clanging around. Heck even the the crank drive pulleys can done from aluminum and they would be fine.

I will finish machining up the oil pan skirt, but I have to move back into manufacturing for a while. taking the days to get this going takes a toll on the income. R&D is always a losing battle in a garage based company.

Reubs you can also drill through that spot in the waterpump cavity
if you already have a cnc plate from Rob.
Would you know what the crank spacer is made from? steel pipe?

Ive been looking for an article on the s1 mx5 that made 166kws atw
from a works b6 engine, it is white and looks sweet. I will be happy
just to use the exhaust cam on the inlet as well as that gives a
good bump from 125hp to about 140hp with good exhaust system.