Wilfreddy
Wilfreddy
5/31/21 5:29 a.m.

Hi!

 

I am wondering about buying a used Mazda 929 Hardtop manual 1.8 liter from 1975. I know the guy selling and he is really nice. He says i can get it for respectively about 350 dollars, (3500 sek). It has a bunch of old planks on top but chassi and engine is in really good condition. Only 90000 km and hasnt been driven since 1991. Me and my dad think it might start after we put the planks away and do some lumber work outside the garage door (big trees are blocking the garage door). I am wondering what kind of power it's safe to put in these things. It is a VB, and we are planning to go for some variant of the dual Weber  config. And more aggressive cams. I doubt anyone has experience of the cars limit but I thought I'd find a car forum and ask.

 

Thanks in advance!

Pete Gossett (Forum Supporter)
Pete Gossett (Forum Supporter) MegaDork
5/31/21 9:06 a.m.

In reply to Wilfreddy :

The first thing with a 30-year old car is to plan on replacing all the rubber components: tires, belts, radiator hoses, brake lines, fuel lines, vacuum lines, etc. Even if they look like they're in perfect condition, they'll likely fail quickly once the car is put back in use. 

You'll also probably need to replace the brake caliper seals(and wheel cylinder seals if it has drum brakes in the rear). 

Don't be surprised if you get engine leaks from valve cover gasket, and the front & rear main seals. I don't know which engine it has, but if it's the BP 1.8 plan on changing the timing belt before you attempt to start it!

I resurrected a 1991 Miata 3 years ago. In addition to all the things above, I also had to replace the fuel pump & filter, rebuild the shifter, replace the transmission output seal(the input seal had been replaced before I got it), replace the driveshaft, replace the radiator, and put fresh fluids in the trans & diff.

It's a lot of work, but at least for the Miata the parts are cheap. The more things you can take care of before you start driving the car, the more reliable it will be, and the less time you'll have to spend repairing it later on.

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