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Showing results for tags 'pistons'.
こんにちは, It's been a while since I have been on but we are finally in our new home and I have had some spare time to pull the z apart. So my question is, what would be the best build for a n42/n47 na set up? That's the block and head I have right now and I believe it shouldn't be a bad place to start. Any of you have experience with this build? I have read mountains on the n42 head but I can't find much on the n47. From the few things I have found some good ideas might be replacing the dished pistons for flat tops. From familiarity on the head I assume it would bring compression up to about a 10:1 and you would have to be crazy to not put a new cam in after that. (270 - 280 degrees on that cam, correct?) After that you would want your head matched up to your exhaust and intake for better flow. What else might you want to do? I currently am running round top SUs and the stock exhaust. The exhaust will be replaced for 2.5 and, if dreams come true, I will switch to some triples. What ideas can you folks dream up for this motor/head? I am not looking for any crazy power upgrade, just something to put a smile on my face. I wan't to make sure I can still daily it without putting racing fuel in it. Thank you in advance, the support I get from this forum by far makes it my go to place.
The other day I had my 260 out and the pedal got stuck under the floor mat. In any case it revved pretty high before I could release it. Now I have a loud valve tap and the # 5 cylinder seems to have lost compression. I did not do a compression test but rather a simple finger over the spark plug hole. Could I have bent a valve? It over revved for maybe 20 to 30 seconds. Can these Z engines typically have piston to valve contact. The head was rebuilt 500 miles ago, timing chain etc all new. Any ideas or suggestions would be appreciated Thanks Glenn
i've miced my cylinders, and the bore on the whole block ranges from 3.3855" to 3.3895", with seemingly no pattern as to which diameter is where. i've never done this before, so please forgive me for asking: is this enough to determine whether i can use standard pistons or not? i'm going to scan the full list of readings and post it soon if more info is necessary. i've been finding some conflicting info about the L28 standard bore. my fsm says that standard is up to 86.050mm, but a piston source i'm looking to buy from says that their standard bore piston is 86.1mm in diameter. lastly, does anyone have any horror stories about black dragon pistons or ITM pistons, or should i not have any problem with either? edit: also, new photos in my flickr set. enjoy!