Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
|
|
Very interesting work - well done. Have you found any difference in flow rate between Weber and Dellorto carbs when they have the same set up, chokes etc? Unfortunately I do not have the variety in brand types to make the comparison. As can be seen by the dates in the thread, the testing that gets done is at best sporadic -  Space is at a premium as I only have a smallish single garage. |
| |
Last Edit: May 27, 2022 8:34:04 GMT by Darkspeed
|
|
|
|
|
|
|
|
|
|
Fascinating stuff man, and I really need to get a flowbench! It's definitely on the list of 'proper garage kit to get' along with a lathe, mill and 3D printer. I expect I'll need one when I start poking around with 2600 heads, and I could run the smaller Triumph ITBs through it.
|
| |
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
May 27, 2022 19:32:17 GMT
|
May 29th 2018 I bought some MDF - June 5th 2018 some tube I bought arrived - 4 years later they have been united - FFS where does time go !    And today I ordered some more tube so that I can complete all the jigs - a 94mm for Rover V8's and a 74mm for Imp engines. |
| |
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
May 28, 2022 18:02:50 GMT
|
Bit more work done on the jig for the C27A head - almost finished - splashed some paint on it to seal the MDF - A few more coats required. Also did the rough cutting work on the jig for the Imp heads - Will do the cutting and rebates for the tube when it arrives.   |
| |
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
|
|
Did some "woodwork" for the Imp head jig - just needs to be sealed painted and glued up.   I will run the numbers on a decent selection of Imp heads and see what we get. |
| |
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
|
|
Graph provided by logicaluk for some triumph work carried out by Gareth Thomas.  From it we can see the flow measured on a Chesman "1020" head - Unfortunately we can only speculate what work was done on it. Approx. 65 CFM @10" at .350" lift - That equates to 109CFM @28" If we use the Superflow power = CFM@10" x 0.43 x cylinders we get 112BHP - Possible. Edited As the scale on that graph is between the marks and not on them so the ACC head max flow is at .400" lift and not .350" |
| |
Last Edit: Jul 5, 2022 15:53:05 GMT by Darkspeed
|
|
|
|
|
|
|
|
Gareth Thomas, haven't seen that name in a few years. He was a thorn in the side of the Sideways Technologies forum. His comments on British tuning companies bordered on libel. Had a very inflated opinion of his own abilities.
|
| |
Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup SOLD
1953 Pop build (wifey's BIVA build).
|
|
|
|
|
|
|
|
Yeah I could never get a proper read on old Gareth. Pain in the backside to get a straight conversation out of. I think he managed to get kicked out of 3 or so different Triumph forums back in the day! But his engines won races so I'd be inclined to believe he knew what he was talking about.
There's a couple floating about for Dolly Sprint and Jag AJ6 heads by him as well. Will be good to see someone try and do a bit of corroboration of some of his graphs, understanding the limitations of comparing different flowbenches and all that. Also, I could never tell how the axes of his graphs lined up. Whether the stated numbers aligned with the lines or the centre of the spaces.
|
| |
|
|
|
|
|
|
|
|
|
| |
Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup SOLD
1953 Pop build (wifey's BIVA build).
|
|
|
|
|
|
|
|
Very interesting. I always wondered what the gain i achieved in air flow was when i converted a set of 40 DCOE's to 40mm Throttle Bodies. I think your testing gives a good idea!!
|
| |
|
|
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
|
|
Also, I could never tell how the axes of his graphs lined up. Whether the stated numbers aligned with the lines or the centre of the spaces. Found the page that graph was on quite a difficult read - as I did the posts he made on that Sideways forum - Rather Bizarre. Not easy to tell as there is very little detail on the method of testing - I am also very sceptical of that Yellow line as something does not look right about that - Same with the exhaust flow information and comparison that is difficult to establish credibility on as there is no information on how it was tested. If you take the graph at face value you would say that some graphs started at 25 thou lift and some at 75 - Convention is that most start at 50 thou and use that as an incremental figure. 10" flow also has quite a few drawbacks when trying to discover if there are velocity issues - Even mine at 28" is considered "slow" these days as the second generation of my bench can flow at up to 40" depression. On those old SF110 benches there a lot of stages that you need to go through to establish the figures and all of those stages introduce opportunities for error - and unless you turn the bench on end and use a special jig exhausts end up being flowed in reverse direction as you would an Intake. Anyways - there is something on an AC head and I have never seen anything before on any Imp head. |
| |
Last Edit: Jun 6, 2022 17:55:21 GMT by Darkspeed
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
|
|
Got some test subjects 180 head - Big valve 1.4" / 1.125 - big port Andy Chesmann head 212 Wills ring 998 bore - Modified combustion chamber     180 head - Big valve 1.32" / 1.125 - larger port head 875 Bore - Standard combustion chamber   180 head - Sport valve 1.28" / 1.06" - Some home porting - Modified combustion chamber   180 head - Sport valves as above - stock casting   I will also grab my stock 107 Sport head and a stock 533 head and put those on the bench as well Manifolds - to be tested Imp Sport unmodified twin CD 125  Fully ported and modified for CD150 Imp Sport manifold Combined 40DCOE/DHLA manifold Single 40 DCOE Manifold - need to have a chat with molebertMay also test a standard log intake manifold if I can be bothered If I manage to get all that done and collated it should make a pretty comprehensive flowbench analysis of Hillman Imp heads and manifolds - Test tube on the 998 head  |
| |
Last Edit: Jun 7, 2022 22:46:21 GMT by Darkspeed
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
|
|
Imp sport manifold ported for CD150    Interesting to note - The stock Imp sport inlet manifold has much smaller ports than the Imp sport head that is necessary for port alignment. |
| |
Last Edit: Jun 14, 2022 17:48:30 GMT by Darkspeed
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
Jun 13, 2022 20:42:08 GMT
|
Still waiting for some paint to dry  Need a couple of coats on it so that I can sand the area for the head to jig super smooth - the rest of it can stay with the brush strokes. Then its out with the Gorilla Glue and some clear silicon sealer should all be done by the end of the week as its only 16 hours between coats and I can only do one side at a time so it takes a while. |
| |
Last Edit: Jun 14, 2022 17:49:19 GMT by Darkspeed
|
|
|
|
|
Jun 14, 2022 18:52:52 GMT
|
|
Looking forward to seeing how these work out. Thanks for taking the time to share.
|
| |
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
Jun 14, 2022 19:01:10 GMT
|
|
Just making a small adapter for the manifold testing - should have that finished tomorrow. Not much will happen tomorrow evening as the Local G15 membership is dropping by for one of our Pizza evenings.
For the heads there is a bit more work as I need to make a valve lifting jig amongst other odds and ends.
|
| |
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
Jun 14, 2022 20:27:55 GMT
|
bizzo has also offered up for testing his Weber 28/36 DCD "Bunch of bananas" manifold so we will have access to most of the Imp tuning manifold options. One of these 
|
| |
Last Edit: Jun 14, 2022 20:28:51 GMT by Darkspeed
|
|
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
Jun 19, 2022 17:18:08 GMT
|
Ran some tests today - all flows in CFM @28"      Manifolds Standard CD125 Imp Sport manifold - 80CFM with a radius on the entry - 78CFM Without Modified CD150 Imp Sport manifold - 100CFM with 99CFM without Banana Weber manifold - 106CFM without Single Weber manifold - 96CFM with radius entry - 93CFM without Twin Weber manifold - 143CFM with radius entry - 143CFM without Then did some testing with carbs fitted Race modified CD150 manifold with CD150 fitted - 100CFM - with and without Radius Weber single with DHLA40 (30mm choke) - 91CFM with Radius - 90CFM without Twin Weber with with DHLA40 (30mm choke) - 132CFM with radius - 131CFM without Weber Banana with 32/36 twin choke 26/27 chokes - 98CFM - no radius used The surprise to me was the performance of the single twin choke Weber "Banana" manifold and looking at the port entry at the carb end there is further room for some improvement there. |
| |
|
|
Darkspeed
Club Retro Rides Member
Posts: 4,889
Club RR Member Number: 39
|
The Flowbench thread.Darkspeed
@darkspeed
Club Retro Rides Member 39
|
Jun 20, 2022 13:37:32 GMT
|
All the test subjects  Test results from the stock Imp Solex and manifold - Not sure what size venturi this one has so will have to check that and then edit. ETA - 22mm venturi  That made 49CFM @28" I also noted that I have tested almost all manifolds with a carb with the exception of the Imp sport with CD125 so I corrected that omission  That made 71CFM @28" with a radius entry and 70CFM without As a summary of all the tests with a carb Stock manifold and Solex - 48CFM Stock Imp sport and CD125 - 71CFM Single sidedraft DHLA40 - 96CFM Weber Banana and 32/36 - 98CFM Modified Sport and CD150 - 100CFM Twin sidedraft and DHLA40 - 132CFM I would have thought that the single sidedraft would flow more than the Banana manifold - and it may do with a lager choke in the DHLA It is interesting to note what individual flows add up to when combined. CD125 Carb - 118CFM CD125 manifold - 80CFM Combined - 71CFM 30mm choke 40DHLA - 197CFM Single sidedraft - 96CFM Combined - 91CFM From memory a 32/36 flows something like - 280CFM Banana twin-choke manifold - 106CFM Combined - 98CFM CD150 - 180CFM CD150 manifold - 100CFM - I suspect that this manifold flows a little lower than the one tested with the combination Combined - 100CFM 30mm choke 40 DHLA - 197CFM Twin sidedraft - 143CFM Combined - 132CFM |
| |
Last Edit: Jun 20, 2022 13:49:35 GMT by Darkspeed
|
|
|
|
Space is at a premium as I only have a smallish single garage.
