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Discussion in '80-Series Tech' started by hazard, Mar 29, 2017.
That is a lot of work to gain 5hp.... are you sure you don't just want a turbo??? lol
Yah but look at torque. more money than brains and its an experiment in perfection. Besides I offers awesome torque curve. I will most likely boost after. Short block will be perfect and bullet proof so ready for anything in future.
do you think 10:1 static can handle some boost on pump gas? Calcs say it can.
Yep it is a great CR for boost. My pistons are 10:1's
what boost are you shooting for and what are you expecting on pump gas?
those graphs were at 87 octane.
Have you worked our your actual compression, cc'd chambers and pistons etc? Have you chosen a cam and worked out dynamic?
you will probably finish ahead of me so I cant wait. Will you engine or chassis dyno?
I will run 93, E85 and likely E99. Hoping for 18psi, 25psi and 35psi(or whatever I can max the turbo out at) respectively.
I have not worked out my actual compression, it will be a touch lower than 10:1, because I am going to do some work in the combustion chamber. I have the cams, but will need new ones.... long story but they were snapped in shipping and I didn't file a claim in time.
I will probably not do an engine dyno just chassis.
Let me know if you want any simulations on my software. Cost a bundle but I don't mind sharing as I have a couple engines in mind after this.
Whose cams did you buy, and, if you want simulation, what spec?
I know it's a pain, but give me your spec (assuming stock displacement, just need cam, header etc) and I'd be happy to simulate.
If you have turbo map, intake specs etc., it would be more accurate. Although it does kinda take the fun out of it.
Have you cc,d chambers and valve reliefs yet? You tcan get very close with just a kitchen syringe or batter bowl.
Without knowing what gasket, chamber, you have you are currently at about 10.3. For every cc on chamber or HG lchanges by about 0.15 CR. So extreme accuracy not important for estimates.
For pot volumes I used a burrette first time but that was slow so I used a kitchen measure after that, I was probably only a few cc,s out on 400cc.
can you run the sims with some of the basic off the shelf cams and bump the CR up to match the off the shelf pistons?
specs for pistons are 8.5 10 and 11.5
cams that would be considered ok for stock ECU (i think) are
INT/EXH - Dur @ .050” Lift: 218°/222° RR: 1/1 Gross Lift: .401”/.401” LSA: 112°
INT/EXH - Dur @ .050” Lift: 219°/227° RR: 1/1 Gross Lift: .397”/.415” LSA: 112°
INT/EXH - Dur @ .050” Lift: 222°/230° RR: 1/1 Gross Lift: .401”/.425” LSA: 112°
That's a lot of calcs. I can't do the cams without all the valve open and close events at.050.
I will send you the calcs of CR changes. Program sets fuel and spark for max power so readings will be high. I could adjust if I knew the stock spark curve and fueling.
Anyone know the stock ignition curve for the 1FZ FE