Anyone know if metric fasteners are used on/in the Toyota engines?
they are for normal Toyotas so I would assume they are on the engines at least. The car bodies and chasis are custom as well so they could use US units.
I’m not really sure, but:
The Big 3 are almost entirely metric now. You still get a few oddball components that might use SAE fasteners here and there (especially on the truck lines), but for the most part they’re running global companies now and in order to mix-n-match cars and components everything needs to be metric.
Secondly, NASCAR vehicles bear essentially no relation to the brands they supposedly represent. The only off-the-shelf component built by the manufacturer is the badge, the rest is custom built by the racing team. Toyota builds a special engine block for this purpose (NASCAR engines must be pushrod V8’s and Toyota has never made a production one), but pretty much everything else is supplied by the same performance parts companies that supply the other teams. I’m fairly sure, therefore, that Toyota’s car has to have at least some SAE parts, since I doubt you can get Edelbrock manifolds or Holley carbs in metric form. But it could be that some of the engine internals Toyota themselves make are metric. The last page of this Car and Driver article about Toyota’s entry may be of interest: http://www.caranddriver.com/features/tundra-and-lightning-building-toyotas-pushrod-v-8-page-6
They are on the Chevys.
NASCAR (at least their top division) switched to fuel injection this year.
“The Big 3 are almost entirely metric now.”
I may be a bit out of date, but my experience has been that the mechanical components (engine/transmission/differential) are still SAE. Everything else seems to be metric. W/regard to my question, the NASCAR engine builders use so many aftermarket parts, which are almost universally SAE, I thought that maybe the Toyota engineers would break from their norm and use SAE on the engines.