jamesinc I played around with the scope some more and worked out that the oscillation you see in the signal is interference from mains AC (if you look closely you can see it has about a 50Hz frequency). This was because I was using a 10x attenuating probe, which means the signal is attenuated by a factor of 10. Switching to a 1x probe, I get a much stronger signal to the oscilloscope and the 50Hz interference is not really visible for most signals.
jamesinc I started porting a 531 head. So far so good, I guess. I need to do a bit more work to straighten out the exhaust runners. They're enlarged at the outlet, but about half way down I haven't taken off much material yet. Around the valve seat is fairly close I think, I was just trying to smooth out the transition between seat and port, and round off the inner radius of the port. I am waiting on intake gaskets in the mail so I haven't done the intake side yet.
jamesinc Fred Long thread! Which page do you detail the engine specs/design on?jamesinc I started porting a 531 head. So far so good, I guess. I need to do a bit more work to straighten out the exhaust runners. They're enlarged at the outlet, but about half way down I haven't taken off much material yet. Around the valve seat is fairly close I think, I was just trying to smooth out the transition between seat and port, and round off the inner radius of the port. I am waiting on intake gaskets in the mail so I haven't done the intake side yet. ^ Here. Not hugely interesting, it runs a KL-Racing T3 cam, 38/46mm valves, ported and polished 531 head, extractors. I'll probably do the plenum and TB next and I've hit the limits of LH-2.4 especially below 2500RPM the EZK just doesn't want to give me the timing I want so will probably move to MS2 or Haltech next.
jamesinc Cylinder head is back, now sporting oversize valves. I've done most of the assembly and I'll have to order 2mm lash caps to run my cam (I have 3mm caps but the new valves are 1mm longer overall so the clearance is too tight for Volvo's usual shim selection).
jamesinc I had to order a set of 1.48mm lash caps to work with the re-cut seats and the new valves being about 1mm longer in the stem than the old ones. They showed up today, so I installed and shimmed/clearanced the cam, and installed the seals. So the head is good to go now, just need to fit it.
jamesinc Philia_Bear;c-151537 wroteWhat did the old head and block look like Block looked good, head looked okay but lot of brown, clearly had been running lean. Injectors look okay, inlet manifold is pretty dirty, everything else looks okay.
AshDVS paul0075;c-151560 wroteGuess you’ll have another head job when I bring my 245 up That's one way of thanking him. I'd probably have simply offered a slab.
paul0075 AshDVS;c-151564 wrote That's one way of thanking him. I'd probably have simply offered a slab. LOL. I’m actually supplying an M47 :)
jamesinc Got it all buttoned back up, power comes in very differently to before. I need to spend some more time fooling around with cam advance. It also really, really needs a better exhaust.
carnut222 jamesinc;c-151603 wroteGot it all buttoned back up, power comes in very differently to before. I need to spend some more time fooling around with cam advance. It also really, really needs a better exhaust. Would be really nice if somebody in AUS would develop a cat-back sport exhaust kit for the 240s that’s bolt-on using factory mounting points, for ~$300-400. Shipping is a killer on the overseas kits and getting one custom made for $1000 here is insane.
Philia_Bear carnut222;c-151609 wrotejamesinc;c-151603 wroteGot it all buttoned back up, power comes in very differently to before. I need to spend some more time fooling around with cam advance. It also really, really needs a better exhaust. Would be really nice if somebody in AUS would develop a cat-back sport exhaust kit for the 240s that’s bolt-on using factory mounting points, for ~$300-400. Shipping is a killer on the overseas kits and getting one custom made for $1000 here is insane. $550 was what I paid last time for a 2.25" header back kit on a NA 240 (pre cat car)
paul0075 Philia_Bear;c-151616 wrotecarnut222;c-151609 wrote $550 was what I paid last time for a 2.25" header back kit on a NA 240 (pre cat car) Bargain, the cheapest I got quoted for standard exhaust from front muffler to tailpipe here in Canberra was $600, the most expensive quote was $1300. I ended up buying it online and had it on my doorstep for under $350
