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Based on mates with swift GTI's they tend to go hard for about the first 5000k's then go down hill from there. Unless they were built with go fast bits i guess. Then we wouldn't be talking budget builds.
I think you better get your facts straight as you sound the same as a rotary motor myth maker.
Every suzuki gti owner I know and have spoken to have taken their GTI motors the famous g13b to beyond 300,000klms with abuse for all its life and never complained about performance.
Ive had several with over 250,000 and they perform like high spec sports cars.
The GTI car is ranked in the top ten most important modern cars of the century.
After market parts are available like you would not believe.
Gonzales in Puerto Rico has taken records for years in the FWD class with standard internals and 30-40psi boost and a local in QLD has taken a 1190cc version to almost 400hp for a slower ET but to illustrate the mighty G series potential.
Weight for a block and head is just on 60kg and 15kg more for ancillaries in the g16. Pikes peak was won many times with twin G series engined beasts also.
When I compared all the motors out there the G series is still being produced on the 1.6 Carry wagon, the sohc 16v head flows more than the twin cam g13b, they are used in light aircraft extensively, they have no VVT or other complex timing systems, they are all pressure die cast alloy and hardly ever blow head gaskets in with extreme boost with standard head gaskets and small and compact.
The only other engine that comes close but has vvt and virtually no performance parts available is the younger brother suzuki J20 from the vitara 2 liter.
A distant 3rd but Nissan/Renault is the Mr20DE followed by QR20de. These Nissan motors are taller but worth while pursuing for the all Nissan aspect. I particularly like the QR20De as it has so many aftermarket bits from Wolfe in the States.