Summary of what's wrong with the race car currently:

Originally dynoed at 180bhp @ the hubs

Seemed down on power during the year

One year later dynoed at 155bhp @ the hubs

Started getting overheating issues so changed thermostat

Next race overheated to around 104 degrees for about 20 mins

Transition from no throttle to minimal throttle became very aggressive

Lots of build up on the spark plugs so felt like it was overfuelling

Compression ratio was 13.4, 10.8, 12.0, 11.0 so not ideal

Took the head off and had it skimmed (12 thousandths), head height is 136.1

Put it all back together, lapping in new valves etc. as best I can (not done it before)

Reassembled with new head bolts, gasket etc.

Put back in the car and compression tested it with result 9.0, 10.0, 13.0, 9.0 even worse than before!

Ran it up in case it needed to run through and bed in but no change

Noticed a water leak from around the water pump area

So at the moment the compression is not good and I've got a water leak. I'll investigate the leak but I'm pretty concerned about the lack of compression. My leak down tester seems to be a bit crap so I'm going to buy another one to verify it.

What could be causing the lack of compression? Other than rings and bent valves is there anything else? One thing I did notice is that all bar 1 of my followers didn't move when I squeezed the inside, they were rock solid. I tried to bang them on a wooden surface to get the inners out and clean it up but none of them would come apart. Could the fact that they're solid be causing the valve to not sit completely against the seat and cause a lack of compression?

________________________________________

Rallye Race Car

Did u do a leak down test??

________________________________________

All u need is a glass of water lol

________________________________________

If the lifters are all solid to touch, it sounds like they are pumped up.

I wouldn't worry about the soft one - I suspect it will be pumped up when subject to oil pressure, and is simply not retaining pressure when the engine is off.

I would try another compression test with around 10-15 ml of oil in each bore.

If the result improves, it's likely to be rings. If it doesn't, it may be a valve seating issue.

________________________________________

Contact Details:

rich@lynxpowerengineering.co.uk
07732 822546

the tappets will compress but should take a little force to do so, if they're squishy then I'd say they were faulty or there's an oil pressure fault (or it just hasn't run long enough)

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

How did you get on in the end?