Quote:
Originally Posted by Herr-Kuhn
Some questions:
What cams are you running?
What is the bore size?
Speed density or MAF controlled?
Batch or sequential?
Knock sensors installed?
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Hi John.
The cams are my billet blanks ground to 250ish duration with 12.7mm lift intake and exhaust. The lobes are optimized for the 35mm bucket size. That much lift takes some clearancing in the heads and is about the limit possible.
Bore=109mm
The Motec uses a combination of TP and MAP, a Bosch TPS and GM 100kpa Map sensor.
The injectors and COPs are both sequential. I use the oringinal S4 ref and sync sensors. The ECU sends its signal to a Motec ignition expander for the multiple coils. The coils are ignited by a pair of Bosch 4 channel ignitors.
I'm testing a standalone knock sensor and looking at having the ECU takes its signal. There's work left to do for that.
Funny you should mention removing sleeves to repair damage. I've already had the pleasure of doing just that! This engine had a valve break at the keeper groove a while back. It did some damage and nicked a cylinder. I didn't like the original honing finish anyway so I had the sleeves replated/honed and now keep an extra on hand.
Originally I honed the block with torque plates mounted but I've changed that. I now have an individual fixture to hone and install the sleeves finished. The advantage is that I don't have to bore the block deeper than the piston travels to allow honing. That keeps more meat in the block. I feel the tradeoff is well worth it, I don't seem to be giving up bore roundness anyway.
You might like my sleeving method. It's a long way from the old days of simply boring a hole and stuffing in a tube. I've developed some details which I'm very pleased with and that part of the engine is not something I worry about anymore.
Thanks for the transaxle ideas. It does take away from enjoying the car to worry that something is going to break and knowing you've put over 600 ft/lbs into one gives me hope
