Mk1 1.6 1.8 differences
Discussion
Wow thanks for the invaluable info lads.
Reason for asking is that my HSK turbo 1.6 suffered an actuater hose failure on a track day and the car stepped out pretty sharpish and blew the inlet servo pipe off.
Testing compression today I have found that 1,2 and 3 are 175 psi but 4 is only 75.
Repair is what its going to be then.
I guess then that you were at Brands last weekend as there was a grid of MX5,s of huge proportions! I was there to support my daughter who was racing in a 540 bhp Porsche 996 GTS and was lucky to chat to a few very decent MX5 drivers.
Reason for asking is that my HSK turbo 1.6 suffered an actuater hose failure on a track day and the car stepped out pretty sharpish and blew the inlet servo pipe off.
Testing compression today I have found that 1,2 and 3 are 175 psi but 4 is only 75.
Repair is what its going to be then.
I guess then that you were at Brands last weekend as there was a grid of MX5,s of huge proportions! I was there to support my daughter who was racing in a 540 bhp Porsche 996 GTS and was lucky to chat to a few very decent MX5 drivers.
Edited by trackerjack on Saturday 16th May 00:40
Well Nikpro can I ask you a question? as you clearly have the credentials.
I hope you had a great weekends racing it was fantastic seeing all the clse racing of the MX5's.
The following pictures are of the offending piston and the engine was a Jap import and seems virtually new as can be seen.
Questions are as follows.
Head gasket quality varies and I use Payen or Reinz, where is the best place to buy them?
Piston rings are also varied so do you recommend any particular type or make?
The rest is straight forward as its a simple 4 pot lump but better made than the usual Triumph Sprint lumps I normally work on.
I guess heat has caused the following fail of ring breakage and land collapse that looks as if partial siezure has also broken the piston skirt.
Last picture is the car the engine is in, it took loads of hours to build and I damage it faster!
I hope you had a great weekends racing it was fantastic seeing all the clse racing of the MX5's.
The following pictures are of the offending piston and the engine was a Jap import and seems virtually new as can be seen.
Questions are as follows.
Head gasket quality varies and I use Payen or Reinz, where is the best place to buy them?
Piston rings are also varied so do you recommend any particular type or make?
The rest is straight forward as its a simple 4 pot lump but better made than the usual Triumph Sprint lumps I normally work on.
I guess heat has caused the following fail of ring breakage and land collapse that looks as if partial siezure has also broken the piston skirt.
Last picture is the car the engine is in, it took loads of hours to build and I damage it faster!
Edited by trackerjack on Saturday 16th May 18:45
Thanks nikpro for the extra help.
No the head is standard and unskimmed.
I will make sure timng is not too advanced.
The HSK comes with a piggy back addition to the ECU and is connected and when I was getting car through IVA had to prove the mixture was about right.
I am running with a Saab 900 intercooler and Aquamist water injection.
I will keep the actuater pipe secure as it was this coming off that caused the failure I think.
I was giving it some beans on track at the time so must be expected though the temperature on track never went above 90deg.
Finally I have just had the fuel pump fail and have bought a new one, it is possible that it might have fluctuated with supply which would not help.
Cheers
Jon
No the head is standard and unskimmed.
I will make sure timng is not too advanced.
The HSK comes with a piggy back addition to the ECU and is connected and when I was getting car through IVA had to prove the mixture was about right.
I am running with a Saab 900 intercooler and Aquamist water injection.
I will keep the actuater pipe secure as it was this coming off that caused the failure I think.
I was giving it some beans on track at the time so must be expected though the temperature on track never went above 90deg.
Finally I have just had the fuel pump fail and have bought a new one, it is possible that it might have fluctuated with supply which would not help.
Cheers
Jon
Edited by trackerjack on Monday 18th May 23:49
Gassing Station | Mazda MX5/Roadster/Miata | Top of Page | What's New | My Stuff