StreetRacerHCI

iTrader: (1)

I need help to better understand what my engine suffers.
My car run ok, no smoke, no loss of power.
I feel only a slight vibration on the gearshift **** and nois like a diesel from my engine.
The compression test by sound is ok for my opinion.

A few days ago I wanted to drive a little bit with my FD, I put petrol and drive. the engine was already in temperature 80° oil temp. I was not running, I just accelerated a little to the max 3500 4000rpm and I heard a noise, not too strong at a TUUMMMP!!!
since then the engine makes a strange noise like a diesel engine

I bought the car a year ago Rebuild by ReWorx 35k miles and I immediately changed the oil and filter (RoyalPurple), I have covered only 1500k miles. After, I changed the oil/filter again and spark plugs (NGK BUR9Q) all holes, spark plugs wires Magnecor R100. Covered only 400/500km and I heard a noise as if something had dropped.
the car run fine no smoke, no loss of power.

after my maintenance, the car was really strong, combustion was better because it was not a lot more flames from the exhaust or smoke of unburned gas. is also why I decided to change spark plugs and spark plugs wires. it was much improved

see the video and give me the opinion please

http://www.youtube.com/user/Streetra.../1/DKsvqujgQ5Q

http://www.youtube.com/user/Streetra.../0/9HXIRELWkzY

performed compression testing done, the sound is clean and strong and shows a good compression of the apex.

http://www.youtube.com/user/Streetra.../0/FAvwvW6r4Pc

http://www.youtube.com/user/Streetra.../1/eoobjJmUzY4

I apologize for my horrible English pronunciation in videos

boostmonkey

sounds like injector issue maybe.

gracer7-rx7

iTrader: (16)

Definitely sounds abnormal. Sounds mechanical though. Try to isolate if the sound is coming from a certain part of the engine bay - top, bottom, driver side, passenger side.

The noise seems to get lounder as the revs increase. Double check that the belts and accessories are spinning normally.

Check around the turbos and exhaust downpipe and cat looking for exhaust leaks.

Your english is fine.

List the mods that the car has. Seems like it may have an intake and inter cooler. What else?

StreetRacerHCI

iTrader: (1)

Thanks for the reply.
My car run whit castum two pipe intake whit HKS filter, IC is Crappy XSpower I wanted to change it before the engine had problems, exhaust full de cat and I flow and stock Japan downpipe whiteout precat, airpump removed, apexi PFC @ 0,85 boost whit stock injectors (duty cycle 85% for 320bhp)

Well, your check list is done. I not find any visible issues.
the worst thing is that while doing the tests, the situation has worsened. I heard another tuump!
and the noise has increased, now a thump thump feels good cyclical.
the noise coming from the front cover near the alternator and water pump, all pulley ok run well without oscillations.

I think is the oilpump issues ? Chain? Gear chain? The oil press on my defy at 80c is 3 3,5 bar max. The sensor installed on oil filter plate greddy

Thanks all

StreetRacerHCI

iTrader: (1)

anyone?

WS6Fanatic

Check to see if you have any vacuum leaks. Fastest way to do this is spray a little carb cleaner in the vacuum areas, and immediately wipe them down. If there's any increase in RPM, look closer in the area you sprayed to isolate the issue. Less dangerous method, check each individual line both audibly and visually. Put your ear down to hear if there is any rushing air.

StreetRacerHCI

iTrader: (1)

I saw and heard the vacuum circuit. is ok. I start the engine for the last test and after the noise is increased, a mechanical noise tumpp tumpp tumpp.

how can a potential problem to the vacuum produce this noise?

RotaryEvolution

iTrader: (30)

does the noise change with the clutch depressed?

in all honesty it's either something with the clutch, a spun rotor bearing or a warped rotor face tapping the side of the rotor housing.

drain the oil and inspect it for metal shavings giving you an idea if it is a rotor bearing or not. if it's ok you can always filter the oil and put it back into the engine if it only has a few miles on it.

StreetRacerHCI

iTrader: (1)

The nois not change whit the clutch depressed.

The nois come from the front cover, tump tump tump... I put my hand on the housing and I not feel anyone vibration or other.
perform the test oil to see if there are metal shavings and tell you the verdict