305 to 350 swap?
#51
Well, I had a talk with the owner of the shop that I intend to have do the actual swap- I would love to do it myself but my helper can't give me all of the time needed, and I don't have sufficient equipment to make it happen, unfortunately.
Anyway, he says to let him know about a week in advance once the motor's about ready and I can bring the car to him to get started- I'll also get my transmission rebuilt at the same time.
He did mention though that it sounded like I was making a lot of compression for street driving and that 94 octane probably wouldn't be enough for 12.75:1- I had previously had someone suggest double-stacked head gaskets to bring it down a bit, so I guess I will be doing that as well.
Just waitin' on the heads and cam, for the moment~
Anyway, he says to let him know about a week in advance once the motor's about ready and I can bring the car to him to get started- I'll also get my transmission rebuilt at the same time.
He did mention though that it sounded like I was making a lot of compression for street driving and that 94 octane probably wouldn't be enough for 12.75:1- I had previously had someone suggest double-stacked head gaskets to bring it down a bit, so I guess I will be doing that as well.
Just waitin' on the heads and cam, for the moment~
#54
I used this:
Sick's Engine Compression Ratio Calculator
I could be horribly wrong in plugging numbers in, but here's what I did.
1
4
3.48
4.166
0.039
60
0
-0.027
I got the head gasket specs off the packaging and had to google the specs of the L98 pistons, so it might be inaccurate there, but I came out with 12.34 compression ratio. I must've done something different last time 'cause I remember coming out higher than that, but anyway.
If I'm wrong and my compression ratio is actually lower than that, well good; that makes it easier I guess.
Sick's Engine Compression Ratio Calculator
I could be horribly wrong in plugging numbers in, but here's what I did.
1
4
3.48
4.166
0.039
60
0
-0.027
I got the head gasket specs off the packaging and had to google the specs of the L98 pistons, so it might be inaccurate there, but I came out with 12.34 compression ratio. I must've done something different last time 'cause I remember coming out higher than that, but anyway.
If I'm wrong and my compression ratio is actually lower than that, well good; that makes it easier I guess.
#58
Enter Bore/Stroke Designation Type - 1 (Inches)
Enter Cylinder Bore Size - 4
Enter Piston Stroke Length - 3.48
Enter Head Gasket Bore Diameter 4.166
Enter Compressed Head Gasket Thickness - 0.039
Enter Combustion Chamber Volume In CCs - 60
Enter Piston Dome Volume In CCs Negative For Dished Pistons (Use '-') - 0
Enter Piston Deck Clearance Negative If ABOVE Deck (Use '-') - -0.027
#59
where did you get the specs for the heads? 60cc is awful small. stock iron heads are 76cc i believe and most aftermarket heads are around 67cc for street use, but of course availible smaller.
#60
I used this:
Sick's Engine Compression Ratio Calculator
I could be horribly wrong in plugging numbers in, but here's what I did.
1
4
3.48
4.166
0.039
60
0
-0.027
Sick's Engine Compression Ratio Calculator
I could be horribly wrong in plugging numbers in, but here's what I did.
1
4
3.48
4.166
0.039
60
0
-0.027
"-0.027" - The deck height is the amount that the block is above the pistons. You used a negative number, which means the pistons are popping out above the block by that amount. That would mean the block has been decked quite a lot! Is that what you meant as well?