Blizzard's rolling rebuild of a 1303 1975

[Blizzard]

Out with the old(er)



I with the (re)new(ed)

[Blizzard]

April 1st.
No joke, it runs and drives super smooth, lots more torq than the Type-1 1904cc..

I started with reamed 47 idle jets reamed to 55. The AFR was good but the engine was not running even on all cylinders.

I measured these jets and they were all differend in size. If I would make them as big as the biggest one the engine would run to rich.

The other jets I have are 52 and 58 Idle jets. The 52 were around 15 and the 58 idle jets around 12 on the AEM Air fuel gauge

I could borrow a jet reamer set from a friend and started to enlarge the 52 idle jets in very small increments until the gauge was showing numbers in the high 13's.
When driving at a constant RPM there was a small dip around 3200 rpm at the transition between the idle circuit and the main jets.
I adjusted the float hight from the starting point of 6mm. to 5.5mm. and the dip was gone.

I will post a youtube link later to show how constant the AFR is from 1000 to 4500 rpm

Very happy with the result.

[Blizzard]

When I'm done with testing carburators and no longer need the AEM gauge and o2 sensor in the exhaust I will replace the CSP Python with the GPP exhaust.

Before I could install that exhaust I had to do some tedious but important mods. First I matched the inside opening of the copper gasket rings to the exhaust pipe.



Now all 4 gaskets have the same size as the exhaust pipe mating surface



On one of the exhaust pipes the mating surface was not completly flat.
On the picture below you can see it almost done, there is still some black marker visible.



And on one side the pipes were not perfectly parallel to each other so I spend half an hour doing this.
Just like Jeff often said on homebuild by Jeff on youtube
https://www.youtube.com/watch?v=jfPmTOin29w

MORE SANDING.. YAY!!.



I did a leak test with an aircompressor and some soapy water and it's leak free.

[Wally]

Nice job! I like the oilcooler positioning in the front spoiler a lot as well.

[Blizzard]

Thanks, the oilcooler is for a Mazda rx7 and fits perfect.

[Blizzard]

This is a very short film during the tuning of the carburators and jets.
AFR at this stage was running a bit to rich under acceleration.

https://www.youtube.com/watch?v=Qydgk9cmUnE

[Blizzard]

Serious question. Is this necessary or not?
Not so serious explanation why I did this. I wanted to go faster when driving in reverse, so I gave my airplane propeller some more air.



Mounted the number / license plate on longer bolts.