Fitzpatrick Speed Works

I have used that engine design thing flat out, but it still doesnt answer my questions about ka24 pistons, or whether the n42 is my best option and how I go about achieving my compression goals?? Any other help out there, Jm, 1fastz???

I wont be running on opti_crap, this car will run BP 100 racing fuel, which in aus terms is 100 octane, and about 96-98 in American terms, do you think I will need to still back down the comp??? I have used the engine calculator flat out but I am new to L series, if I was building a RB I would be set I have built over 30 Rb's, The motor will run tripple 48mm's, they are pretty big but as I already have the carby's lined up and at a good deal this is what I will be using. How easy are E_88 to get and what dollars do they command, I have read here there are 4 types of E88 and 2 of them are rubbish. I can weld the head myself are you sure the e88 is the way to go? Thanks for your advice Ozconnection appreciate the

Ok so I am to stick with the N42 head, how do I acieve my comp in the best possible way? Shave or weld? Can someone tell me the specs that I need to supply to get the pistons made, has anyone here ordered them what are the pin heights, cc, deck height etc?? Thanks for the advice so far, appreciate the imput!

Hi all, First post long time reader. I have spent the last 3 months using the search function in the L6 section gathering as much information as possible but still have a few questions. I am building an N42 L28, currently the motor is in stock configuration with a N42 head. I want to build the motor to achieve around 200-220rwhp. I can have the compression at around 11:1 or even 11.5:1 as where I live in Australia 96 RON fuel is easily obtainable at a reasonable price and the car I am building it for will only see 500-600 miles a year if its lucky. My main question is in relation to the head I go with. I have a E-30 head here also. I am wondering to achieve that kind of comp with a L28 rod, L28 87mm flat top I may need to close the chamber on the N42 or will a .80 thou shave achieve what I am after? Obviously for the kind of power I am after I am willing to spend the money and time on the head, would it be more worth while to put the N42 valve train into the E30 head. Will I be able to port the E30 big enough as I know the ports are quite small?? Sorry for all the questions but having used the search I have found many conflicting points of view. Is there any way to achieve a close to 0 deck height with ka24 pistons. I can use a l24 rod out of a l24 I have but my understanding is that the piston will still be down the bore and obviously with that I wont achieve the comp I am looking for. I saw a post buy a gent here saying that he used Ka24E pistons that where shaved flat and valve reliefs put in, the post seemed to suggest that his deck height was basically 0. Is that actually achievable, is there differences between ka pistons, which one should I be looking for, as a 89mm bore would be appealing to me, and work better over the L28 1mm over piston as this will also help with my comp aspirations or am I off the money here? Thanks for all the wisdom, I have all the L series books and read alot of literature on the subject but the people on this site have by far taught me the most. Regards, Daniel