Home of Racing's Best and Brightest
https://www.speed-talk.com/forum/
Stock 426 hemi valve angles are 35° intake and 23° exhaust. (+,- 1/2 degree or so) So around 58 included.Truckedup wrote: ↑Thu Mar 01, 2018 9:34 amYou mean a old school Hemi with a 90 degree valve angle?Frankshaft wrote: ↑Thu Mar 01, 2018 9:28 am Other criteria remember, is availability. Sure hemi's are great, but good luck finding one. If you do, you could send one of your kids to college for a year or 2 for what you will pay for it and redo it. Same with the ford, as far as availability for the trick heads they had. I get it, the ford has a 4.9 bore space and a bigger cam core stock, bot, I didn't say you can't machine the tunnel for a bigger core.
I was thinking of the 1950's Hemi...Ron E wrote: ↑Thu Mar 01, 2018 3:54 pmStock 426 hemi valve angles are 35° intake and 23° exhaust. (+,- 1/2 degree or so) So around 58 included.Truckedup wrote: ↑Thu Mar 01, 2018 9:34 amYou mean a old school Hemi with a 90 degree valve angle?Frankshaft wrote: ↑Thu Mar 01, 2018 9:28 am Other criteria remember, is availability. Sure hemi's are great, but good luck finding one. If you do, you could send one of your kids to college for a year or 2 for what you will pay for it and redo it. Same with the ford, as far as availability for the trick heads they had. I get it, the ford has a 4.9 bore space and a bigger cam core stock, bot, I didn't say you can't machine the tunnel for a bigger core.
The early 331/354/392 hemi angles were symmetric at 26.5° each for a 53° included angle. But, I've seen some of the early European engines close to what you're talking about. They had to have healthy (ugly) domes to get to 7 to 1. I can't remember any specific brands. But, they were some of the "exotic" engines of their time. (When most everything is a flat head its not that hard to be exotic.)
Stupid question regarding a flat head. If you ran it upside down, would it be an overhead valve engine, and make more power?Ron E wrote: ↑Thu Mar 01, 2018 6:07 pmThe early 331/354/392 hemi angles were symmetric at 26.5° each for a 53° included angle. But, I've seen some of the early European engines close to what you're talking about. They had to have healthy (ugly) domes to get to 7 to 1. I can't remember any specific brands. But, they were some of the "exotic" engines of their time. (When most everything is a flat head its not that hard to be exotic.)
Things like Porsches and Alfas that are hard to get more than 100hp/litre from.Ron E wrote: ↑Thu Mar 01, 2018 6:07 pmThe early 331/354/392 hemi angles were symmetric at 26.5° each for a 53° included angle. But, I've seen some of the early European engines close to what you're talking about. They had to have healthy (ugly) domes to get to 7 to 1. I can't remember any specific brands. But, they were some of the "exotic" engines of their time. (When most everything is a flat head its not that hard to be exotic.)
About the exact same limit on 90 degree valve angle bike engines even after raising port floors etc...That's also the wedge head limit other than for short duration racing? And maybe the 426 Hemi?Momus wrote: ↑Fri Mar 02, 2018 10:04 amThings like Porsches and Alfas that are hard to get more than 100hp/litre from.Ron E wrote: ↑Thu Mar 01, 2018 6:07 pmThe early 331/354/392 hemi angles were symmetric at 26.5° each for a 53° included angle. But, I've seen some of the early European engines close to what you're talking about. They had to have healthy (ugly) domes to get to 7 to 1. I can't remember any specific brands. But, they were some of the "exotic" engines of their time. (When most everything is a flat head its not that hard to be exotic.)