HKDxSAVIER
New Member
how much am i looking at spending if i resleeve the b20b labor and parts?
what to bore motor to
- Thread starter emd513
- Start date
mirrorimg
Well-Known Member
The intake cam may be slightly different, or the exhaust, im not sure which. The valve covers are interchangeable between all non-vtec B-series motors.
BrokenTalon27
W.F.O
It depends on the shop. You just have to call around and see.
imcnblu
Resident G2 Guru of C-I
I have a B18A1 with a 98spec B18B valve-cover. valve covers can be swapped easily. same motor, the only differences between the A1 and the B1, mechanically are the following:
different Intake Manifold (B1 has a SLIGHTLY better design, and flows SLIGHTLY better. More for better fuel atomization, than a power maker)
SLIGHTLY more aggressive camshafts. Difference is almost unnoticeable, realistically.
Otherwise, the differences are purely cosmetic (valve-covers, engine stamps, etc.) Distributors and fuel components were all the same from 90-01, just wired differently for the varying OBD designations, and occasionally, added sensors etc. as the years went on. Again, for OBD purposes.
My B18A1 with the 98 spec B18B valve cover (also found on later model B20's)
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on the subject of boring a B20 for boost, for the person that asked... DON'T DO IT. Unless reinforcing the cylinder walls, I wouldn't bore a b20 for NA or boost. the cylinder walls are already dramatically thinner than the cylinder walls in an LS.
LS bore is 81mm vs the B20 bore of 84mm. The B20 gets its added displacement SOLELY from the bigger bore, as the stroke is exactly the same between the two (89mm). In fact, with the exception of the pistons, the B20 and all LS motors share the exact same rotating assembly (crank and rods). Same stuff, part number for part number.
Samurai_Blue
Yolo Whippin'
whats wrong with a dremel and sand paper....when you port and polish you use either a dremel or some air tool with a rock grinder...same thing i feel the dremel allows you to be more precise.
yes
emd513
New Member
dremel n sandpaper only really polishes the walls n ur head. use a carbide bit for steel n actually shave down the walls. on 350 heads a real good port job should take at least 75 hours to complete. n u use the dremel after to polish them with sand paper that give u the maximum port u can have with out going to far n the horsepower n torque gains r fucking nuts by just doing that. if u know anything about sb chevys u can take a 350 block notch n put 400 crank n rods in it with 40 over piston n run a 10:1 compression with stock heads n get approx 350 horsepower but if u port n polish like i just explain the number is more like 750 horsepower. BIG difference n worth the work. then if u go like i am with that set up n run 250 shot the last time i saw it done the guy hit 978 horsepower with 942 torque thats enough for me. BACK TO THE TOPIC if 82mm is as far as i can go what is that 20 over 30 over r is there anything else that i need to know size wise when ordering my pistons. like i said this is the first honda motor ive built so any info is really appreciated. also if i decide to go bigger than 82mm n need to sleeve how much work am i looking at is that going to be pretty simple for a machine shop r am i looking at a whole lot more money to sleeve
mirrorimg
Well-Known Member
You cant go beyond 82mm on stock sleeves.
emd513
New Member
im going to do that then get bryan crower stage 3 cams with valve springs n h beam rods then im going to see if my mother inlaw that works a trw will make me slightly bigger valves for my head n have it ported like i want n the valves set n for me then i have to look n see about intake n throttle body. also does anyone know anything about the jackson hewitt supercharger kits. n if so r they worth the money
imcnblu
Resident G2 Guru of C-I
B18's can be bored to 84mm without worrying about TOO much cylinder wall stress.
That's what B20's are, and they are basically an overbored B18A/B18B. The only thing I'd worry about on 84mm cylinders would be if you were running a high rpm with a high powered engine. People do B20VTEC builds on stock bore and run 8500rpm all day on them with no problems. It really all depends on how high your compression is, and how well balanced your bottom end is. If its not balanced, harmonic irregularities could cause serious issues for upper cylinder wear and tear. Stroke/rod ratio play a big role as well. Since, I'm assuming you're going to be running stock stroke (89mm), you should be fine. As long as this build stays fairly mild, I wouldn't worry too much.
That's what B20's are, and they are basically an overbored B18A/B18B. The only thing I'd worry about on 84mm cylinders would be if you were running a high rpm with a high powered engine. People do B20VTEC builds on stock bore and run 8500rpm all day on them with no problems. It really all depends on how high your compression is, and how well balanced your bottom end is. If its not balanced, harmonic irregularities could cause serious issues for upper cylinder wear and tear. Stroke/rod ratio play a big role as well. Since, I'm assuming you're going to be running stock stroke (89mm), you should be fine. As long as this build stays fairly mild, I wouldn't worry too much.