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Excellent. Thank you all for the input. If I may steer the discussion to materials. I'm considering building the exhaust manifold flange and the first 4" of primary tube out of aluminum. Then attaching slip fit primaries. The rational is that this will aid in dissipating combustion heat...

You got me. Any input on the effect on the torque curve of advancing the catalytic converters position by ~12"?

Any input on the effect of advancing the catalytic converters position by ~12" on the torque curve?

Peter, Thanks for the input but I think I would rather stick with my simpler method. With the wire frame I won't have to trouble with mitering the flex tubing and my space constraints are likely more lax than most; 25cm+ for each manifold from cylinderhead to chassis bulkhead. Inline...

...seat (~1062sqmm cross section), which wil step up to 1 5/8" (~1233sqmm cross section), then primaries stepping to 1 3/4" (~1439sqmm), then a 13* merge collector transition to 2" (~1897sqmm) and straight to atmosphere not far from there. I'll be designing the layout of everything involved...

Gents, the plethora of exhaust diameter calculators available online are giving me a wide variety of ideal primary diameter, and that's a problem; there's only one ideal. I'm working on cam and exhaust manifold designs for a 3.5 V6. In a recent thread there are some equations but they seem to...

I'm working on plotting the lift curve for the regrind profile right now. When I get that figured I can talk details of the acceleration curve. I looked through the forum trying to find some good info on stem/guide clearance and found a few old locked posts. Someone mentioned running them so...

Here's a more direct question; How do you feel about the possibility of replacing a OEM 36mm IN valve with a 35mm Ferrea Comp Plus IN valve considering the following: 1. The OE valve is 54g compared to the 35mm's 50g. 2. Honda replaced the 36mm IN valve with a 35mm valve of nearly identical...

...CNC'd for a J series regrind. At this point I've only gone into the CAD model and measured the lobe lift in individual degrees for -10 to 45* ATDC. (The cam data from the regrinder was presented in duration per given lift and lca's) I charted the cam angle by individual degrees manually...

I'm trying to use valvesprings in my application (Honda V6, J32a2) that were designed for a different vehicle. The spring dimensions are workable and the seat pressure and open pressure are just what I'm looking for. The caveats are; 1. Installed spring height needs to altered with shimmed...

Thanks everyone for the input. I really do appreciate you taking the time to inform me. I know I've seen it discussed around here in the past but I can't seem to find it now; What grit should I take the intake tract to? My guess/vague memory is 80grit but I want to get some professional...

naturalextraction; The intention is to have a weekend warrior/ NASA time attack vehicle. Thanks everyone for your input. I went ahead and started another thread to ask my elementary questions and there is a link to a web-album of the buildup there...

No it is not a FI project as of yet. I intend to eventually build a bullet-proof bottom end for it and run a pair of large Rotrex superchargers, but that won't happen until I have the chassis in a state capable of making use of that much power, and the rest of the engine, fuel, coolant, and...

Again, everyone, thank you for the input. Pat, the factory HG is .75mm thick and three layers. I intended to only run a single layer of it, but it sounds like I can make sure the dome sits flush with the top of the bore, fill the quench pad with weld, and then have it shaved a few thousandths...

Tmoose; when referring to increase in quench area I am referring to a decrease in piston to chamber clearance. I understand that the last moment "squish" of charge that had occupied the open space BTDC is beneficially agitative, and the resulting denser a/f helps provide a faster combustion...

Also, Pat, do you recommend polishing the dome, chamber, & exhaust port over ceramic coating?

Thank you gentlemen for bringing me back down to earth. Any advice on determining a good length for the headers I am going to start on in a few weeks? The factory manifolds have ~12" long primaries, and that seems to be the pattern even with headers. I was going to try a best-guess length of...

Well I actually have two sets, but I'm really hoping I don't have to trash any. I get your point though. My thoughts were to leave to floor depth the same, add 1mm around the sides, widen the throat a couple mm's @ the split point, blend the valve seats, and then lightly radius the bowls...

Thanks for the reply. These engines are producing ~300hp @ the crank from the factory, so I think the head is optimized for ~395cfm. A few guys run them with basic bolt-ons and are seeing ~300hp @ the wheel; ~340hp @ crank; ~430cfm. Both of these examples are making this power at ~6700rpm...

I would like to open this thread and keep it as the place that I come to seek advise on an engine build I am in the process of, without cluttering the forums with repeated elementary questions. I'm working on a naturally aspirated build; Honda J series V6. I'm doing everything that can be...