68 replies to this topic

[rexy]

It looks good. Not sure that it will make more power than your old harrop one would have though. What was the reason for the change?

[myss427]

Amazing for a duel plane!

[Redslur]

New technology is getting good results out of dual plane manifolds now.  My dyno tuner told me to piss the Harrop high-rise off an go dual plane and I would gain 20hp...This was on my 355.

[cameron]

Be interesting to see dyno comparison with the TP or Harrop single plane as no dual plane I have tested has ever come close to matching a single. Low in the rev range you might pick some small gains in torque but after around 3500rpm the singles just breathe far better and make far more ponies. The small torque gains in a dual depend on how well the cam is matched as the dual will choke the engine as the revs increase.

 

Cameron

[Redslur]

My dyno tuner (Jake Edwards) said from his experience in building 355's, the highrise single planes are a bit too big and better suited to 383's.  He said that the new high rise single planes, which i have purchased for my new 355, work very well and are better suited to the 355's. I would also be keen to see the figures as a comparsion.  I am actually getting mine dynoed soon and it is essentially the same set up as my last 355 but carby, not injected and dual plane compared to Harrop single plane highrise. The last set up went 340RWHP through a T700 and 9 inch diff.

[cameron]

My dyno tuner (Jake Edwards) said from his experience in building 355's, the highrise single planes are a bit too big and better suited to 383's.  He said that the new high rise single planes, which i have purchased for my new 355, work very well and are better suited to the 355's. I would also be keen to see the figures as a comparsion.  I am actually getting mine dynoed soon and it is essentially the same set up as my last 355 but carby, not injected and dual plane compared to Harrop single plane highrise. The last set up went 340RWHP through a T700 and 9 inch diff.

 

 

Its all about the combo and the way you drive the car, "so for your setup" Jake might well be right. I like a hard revving engine so dual planes have never produced good dyno results but I have been injected for the last 20yrs so perhaps the new stuff has closed the gap and gained hp in the upper revs? Singles always need a decent sized stick and port work to make them sing.

 

Cameron

[Redslur]

Agree entirely.  My last 355 with the Harrop high-rise with a big roller went 570hp and loved revving at around 7200rpm. I have now gone for a smaller mid range solid with the dual plane and am chasing a solid 450hp. So all depends on what you are after...

 

The new TP dual plane I have advertises power range from 3500 - 7000.  They are basically a high rise manifold but dual plane for more low down torque. The new engine feels strong all round but too early to tell how hard it goes. Should get me 11's again though by the feel of it.

[cameron]

     Cant be disappointed with a car capable of 11's.

 

Cameron

[rexy]

Engine builder said it def will make more power . It flowed tested and said its good for up to 570hp

Out of interest was that "out of the box" or did it have a bit of work done to it before testing?

[LS1LX]

Are you running a scoop or does this new manifold combo fit under the bonnet

[myss427]

What compression ratio are you trying to achieve with the dished pistons?