Titanium valves - How much HP ?
Discussion
OK guys time for some fun ... it's Christmas
I have a little SBC engine that produces 640 bhp, the engine went back to American Speed after all the power runs ( I insisted on this as part of the deal ) to break records, the engine was perfect but while I was at it, I asked for some Titanium valves to be install ..
No other work was done, ie head or cams, rev limits and all other parameters the same ..
So pre Ti Valves = 640bhp 377 ci
Post Ti Valves = ???? 377 ci
The winner gets a ride at VMAx, or beers at Le Mans or bottle of wine ...they choose
Answers on Sunday ..
G Man
I have a little SBC engine that produces 640 bhp, the engine went back to American Speed after all the power runs ( I insisted on this as part of the deal ) to break records, the engine was perfect but while I was at it, I asked for some Titanium valves to be install ..
No other work was done, ie head or cams, rev limits and all other parameters the same ..
So pre Ti Valves = 640bhp 377 ci
Post Ti Valves = ???? 377 ci
The winner gets a ride at VMAx, or beers at Le Mans or bottle of wine ...they choose
Answers on Sunday ..
G Man
) 
I wouldn't have thought a change of material weight would have made any difference unless you increased the rpm threshold or the valves and seats had recut angles.
So assuming there were some revised angles I'll guess at 664 bhp.
If valve seats etc remained the same I'd say 640 hp.
Boosted.
So assuming there were some revised angles I'll guess at 664 bhp.
If valve seats etc remained the same I'd say 640 hp.
Boosted.
canam-phil said:
I wouldn't have thought a change of material weight would have made any difference unless you increased the rpm threshold or the valves and seats had recut angles.
Boosted.
Am I missing something here, what do you mean by rpm threshold?
Well, lighter valves allow higher rpms to be used whilst maintaining some reliability and that is where you can gain extra bhp. If the rpm's stay the same as before then the engine isn't pumping any harder or drawing in more air. So, you could make valves from anything you like but the airflow won't have changed just valve train mass.
If the valves are a better shape then the ones previously fitted more air will flow into the engine and power/torque will increase, assuming the former valves were restrictive. So, if there's a significant power gain then I'm intrugued to see what caused it
My 2 cents, sorry tuppence
Boosted.
Boosted LS1 said:
Well, lighter valves allow higher rpms to be used whilst maintaining some reliability and that is where you can gain extra bhp. If the rpm's stay the same as before then the engine isn't pumping any harder or drawing in more air. So, you could make valves from anything you like but the airflow won't have changed just valve train mass.
If the valves are a better shape then the ones previously fitted more air will flow into the engine and power/torque will increase, assuming the former valves were restrictive. So, if there's a significant power gain then I'm intrugued to see what caused it
My 2 cents, sorry tuppence
Boosted.
Interesting Ideas Boosted , much is sound , but you have missed something ....
G MAN
My guess is that unless the valve train was limiting the max revs and the hp curve was still on the up at the old max revs, then the titanium valves would have marginal bhp effect. Gman, did you ever say what revs the max bhp was developed at?
So I am theorising that the torque/hp curves are very much the same up the rev range. May be very marginal changes due to valve flow but more down to atmospheric test differences that are compensated out by the calibration factor.
Gman, are you going to publish both dyno charts for us all to look at?
So I am theorising that the torque/hp curves are very much the same up the rev range. May be very marginal changes due to valve flow but more down to atmospheric test differences that are compensated out by the calibration factor.
Gman, are you going to publish both dyno charts for us all to look at?
G Man,
We need to know if the seats are unchanged and the valve angles the same Apples to apples and all that.
Also tell us if the stems are waisted or if the valves have different profiles behind the heads. Oh, are they sodium exhausts and hollowed inlets Gotta ask that one.
Ah, I get it. You've done a 4 valve head
Boosted.
We need to know if the seats are unchanged and the valve angles the same
Apples to apples and all that. Also tell us if the stems are waisted or if the valves have different profiles behind the heads. Oh, are they sodium exhausts and hollowed inlets
Gotta ask that one. Ah, I get it. You've done a 4 valve head
Boosted.
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