Post your dyno curve here
Discussion
I went for the proverbial "spirited drive" a couple of days ago and I couldn't help but think that I couldn't at any time, (country lanes) plant the throttle for more then a couple of seconds.
I know that everyone wants more but there is a point where "more" on the road just isn't useable.
That aside, hats off to you guys for achieving so much from so little.
I know that everyone wants more but there is a point where "more" on the road just isn't useable.
That aside, hats off to you guys for achieving so much from so little.
Forged pistons and H beam con rods
As this is the place to discuss big power
Are any of you guys using the above!
I'm under the impression the standard pistons are never normally a wear point, rather the rings or the bore goes long before you get piston issues so is this over kill on say a 4.6 producing around 350 bhp.
I'm just wondering if I go for higher power ie more tuning ( FI ) will the standard pistons handle it ok.
Maybe my question is at what power threshold would forged pistons and stronger rods become vital ?
Thanks in advance Alun
As this is the place to discuss big power
Are any of you guys using the above!
I'm under the impression the standard pistons are never normally a wear point, rather the rings or the bore goes long before you get piston issues so is this over kill on say a 4.6 producing around 350 bhp.
I'm just wondering if I go for higher power ie more tuning ( FI ) will the standard pistons handle it ok.
Maybe my question is at what power threshold would forged pistons and stronger rods become vital ?
Thanks in advance Alun
ClassiChimi said:
Forged pistons and H beam con rods
As this is the place to discuss big power
Are any of you guys using the above!
I'm under the impression the standard pistons are never normally a wear point, rather the rings or the bore goes long before you get piston issues so is this over kill on say a 4.6 producing around 350 bhp.
I'm just wondering if I go for higher power ie more tuning ( FI ) will the standard pistons handle it ok.
Maybe my question is at what power threshold would forged pistons and stronger rods become vital ?
Thanks in advance Alun
My lump has forged pistons and H beam rods Alun, also runs a CR of 10.6:1 Engine spec is on my profile page... As this is the place to discuss big power
Are any of you guys using the above!
I'm under the impression the standard pistons are never normally a wear point, rather the rings or the bore goes long before you get piston issues so is this over kill on say a 4.6 producing around 350 bhp.
I'm just wondering if I go for higher power ie more tuning ( FI ) will the standard pistons handle it ok.
Maybe my question is at what power threshold would forged pistons and stronger rods become vital ?
Thanks in advance Alun
db484bhpv8 said:
ChilliWhizz said:
My lump has forged pistons and H beam rods Alun, also runs a CR of 10.6:1 Engine spec is on my profile page...
Bespoke cam? Do you know the spec? Is it a mechanical?It comes to life mid to upper range rpm, so it doesn't have the low down easy driving grunt of the standard 500. Rob once described the cam as 'somewhere between a Stealth and an H404'
Chilli
Yep good point Peter... your extra 500cc obviously contributes, and I have to confess sometimes I wonder why I have a higher power than torque figure 
the 'norm' always seems to be a higher torque than power figure... It would be interesting to see what a 'torquey' cam would do to the old girl for road use....
Anyway, sun's out, just given her a shampoo and leather, roof's off, so we're off to find some twisty country lanes
the 'norm' always seems to be a higher torque than power figure... It would be interesting to see what a 'torquey' cam would do to the old girl for road use.... Anyway, sun's out, just given her a shampoo and leather, roof's off, so we're off to find some twisty country lanes
Edited by ChilliWhizz on Sunday 8th March 12:08
Daz, what cam and heads have you got? Our figures are quite similar, I've got 14 more bhp but you have 12 more lbsft...
What's particularly interesting is that at 3k rpm you have 200bhp compared to my 175, and 350 lbsft compared to my 290
Then at 4k rpm you have 270bhp and I have 260, and you have 360 lbsft and I have 340.....
OK, appreciate different RR's, but on paper it looks like I've sacrificed a shed load of mid range power and torque for a few extra willy waving bhp at the top end.. In fact it's not till we hit 5k that my bhp starts to edge ahead.... We may have the same heads (V8D stage 4), but based on your figures it doesn't look like my (differences to your build) bespoke cam and triple plenum are doing me great favours..
Hat's off to you though, that's a strong (power and torque) engine you have there
Chilli (slightly disgruntled. maybe even a bit upset... definitely not happy)
What's particularly interesting is that at 3k rpm you have 200bhp compared to my 175, and 350 lbsft compared to my 290
Then at 4k rpm you have 270bhp and I have 260, and you have 360 lbsft and I have 340.....
OK, appreciate different RR's, but on paper it looks like I've sacrificed a shed load of mid range power and torque for a few extra willy waving bhp at the top end.. In fact it's not till we hit 5k that my bhp starts to edge ahead.... We may have the same heads (V8D stage 4), but based on your figures it doesn't look like my (differences to your build) bespoke cam and triple plenum are doing me great favours..
Hat's off to you though, that's a strong (power and torque) engine you have there
Chilli (slightly disgruntled. maybe even a bit upset... definitely not happy)
ChilliWhizz said:
Daz, what cam and heads have you got? Our figures are quite similar, I've got 14 more bhp but you have 12 more lbsft...
What's particularly interesting is that at 3k rpm you have 200bhp compared to my 175, and 350 lbsft compared to my 290
Then at 4k rpm you have 270bhp and I have 260, and you have 360 lbsft and I have 340.....
OK, appreciate different RR's, but on paper it looks like I've sacrificed a shed load of mid range power and torque for a few extra willy waving bhp at the top end.. In fact it's not till we hit 5k that my bhp starts to edge ahead.... We may have the same heads (V8D stage 4), but based on your figures it doesn't look like my (differences to your build) bespoke cam and triple plenum are doing me great favours..
Hat's off to you though, that's a strong (power and torque) engine you have there
Chilli (slightly disgruntled. maybe even a bit upset... definitely not happy)
I think a`lot of it is down to a good mapper ,the easy bit is top end power but getting it there is the tricky bit .What's particularly interesting is that at 3k rpm you have 200bhp compared to my 175, and 350 lbsft compared to my 290
Then at 4k rpm you have 270bhp and I have 260, and you have 360 lbsft and I have 340.....
OK, appreciate different RR's, but on paper it looks like I've sacrificed a shed load of mid range power and torque for a few extra willy waving bhp at the top end.. In fact it's not till we hit 5k that my bhp starts to edge ahead.... We may have the same heads (V8D stage 4), but based on your figures it doesn't look like my (differences to your build) bespoke cam and triple plenum are doing me great favours..
Hat's off to you though, that's a strong (power and torque) engine you have there
Chilli (slightly disgruntled. maybe even a bit upset... definitely not happy)
I have the Stealth Cam But i never got the build sheet . The reason i got a good deal is because someone paid a big deposit then pulled out so all the stuff was there for the build .
Rob seemed to think the heads are stage 4 .. non of it matters its got decent power and is smooth to drive
Last visit to Pod i managed 12.4 that was when I missed a gear ..
I went 158 miles from Nottingham to Blackpool yesterday ,on my lean map it did over 27mpg .
Next job 3.08 diff for low rpm cruising .
Edited by SILICONEKID345HP on Sunday 8th March 14:50
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