RX7Club.com - Mazda RX7 Forum - Rebuild or new engine?

RX7Club.com - Mazda RX7 Forum (https://www.rx7club.com/)

- 3rd Generation Specific (1993-2002) (https://www.rx7club.com/3rd-generation-specific-1993-2002-16/)

- - Rebuild or new engine? (https://www.rx7club.com/3rd-generation-specific-1993-2002-16/rebuild-new-engine-1127848/)

Rebuild or new engine?

So I have a 93 R1 with 76k miles on the original engine and BNR S3 turbos with close to stock boost. I've started tracking the car, so I want to make sure that everything is solid and reliable. I have a proper A-spec single turbo kit ready to bolt on as well.

The car currently runs fine, but I think it would be wise to refresh things before continuing to do more track days and driving harder and faster. I am not fast so big power is not the goal, just want a reliable set up so I can concentrate on driving and not so much intake air temps and boost leaks. Here are a few options I've been considering and want to see what you would do:

1. Drive it til it breaks and rebuild. I've been told that this puts risk to the housings so may not be the wisest decision. Also potential to ruin a track day, plus cost in towing and making a mess on track.
2. Buy a new engine from Mazda...I don't feel the need to open it up and port the engine since 350-380whp is way more than what I need for a road course.
3. Pull my engine as is and rebuild...then I might as well open it up and port it at the same time.

What would you do?

Why not do both?

Find a junk engine to supply as a core then buy a new engine. Swap the new engine in, then rebuild the current engine in your leisure time. That way you'll have a replacement engine on hand for if/when you need it :)

I’d compression test your existing motor. Also verify cooling and fuel systems are up to snuff. If all checks out then leave it and don’t create a problem where there isn’t one. There are going to be plenty of things that need your time and attention to track a FD regularly so don’t bog yourself down on non-issues.

Hows your tune? When is the last time it was done? That’ll have more effect on your motor life on track than most things.

dhttps://cimg5.ibsrv.net/gimg/www.rx7...63e412eae9.jpg
I have brand new engines on sale for $4549 this week. This is a 100% brand new Mazda oem short block down to the last nut and bolt. Includes new oil pan, flywheel, oil injectors, etc. 1 year/12,000 mile warranty. They are the best deal by far to start with all new parts, whether you drop it in as is or disassemble for a build. Ad the cost of brand new rotor housings to most builds and it would be more cost effective to buy a new motor. No core required either.