This combination was in roadster last summer . Now we are looking new frame for it. Do anyone have a good rolling FED-frame or altered on backyard?

-jyrki from Finland-

www.hollowheads.net

Our measuring point for the boost pressure is taken just above the intake runner number eight at the left intake manifold and the other point is just above intake runner number four at the right intake manifold. These two points are connected together and then routed to the boost gauge. 10.3 psi from there.

 Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)

Thanks for the info.  I'm building for street drivability and engine life, so am happy with 6 psi.  I think to make more than 6 psi effective rather than reaching diminshing returns, I would have to make quite a few more changes to the heads, etc. to make it flow.  I'm keeping it simple and trying not to dodge flying parts! Seriously, it is fascinating to see what you are achieving.

By the way, it just occured to me that I am talking about boost measured in the intake manifold.  If I measure boost at the blower outlet, it will be 10-12 psi.  The boost in the intake manifold is a closer measure of what is getting into the cylinders (even less than 6 psi) after pressure losses getting through the bonnet and the carbs.  So technically, I am speaking about 10-12 psi of boost, but when it is measured in the intake manifold, it is a lot less.

Sweet!  When you guys get all of that figured out it will be very strong.

Then you should put it into kit form.

Lawrenceville, GA

Seppo - Congrats on a great set of runs - you guys are really getting up on your game. The little roadster is going to be a wild ride.........

US guys - the conversion factor for "Newton Meters" to Ft-Lbs is:

Nm x .7306 = Ft-Lbs

 
 Steve Metzger       Tucson, Arizona

The exhaust pressure is measured under the turbo flange, so the turbo is the biggest restriction. It just doesn't flow enough at the exhaust side and it starts to slow down the engine after 3000 rpm.  

Our primary tubes are 1.5 inch diameter from the inside and after the collectors the tube size is 2.5".

The down pipe from the turbo is 3" diameter.

6 psi is for chickens . At first I planned to try 10 to 17 psi at the dyno, put I quess it was wise to stay at 10 psi with the totally stock bottom end with cast pistons and 630 Nm of torque?

 Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)

Holy smokes.  That thing is cooking!  What type of heads, exhaust valves, and header pipe sizes were you running?  I am building a blown y-block and have a discussion going in another thread about what size headers to build.  Is your flow restriction in the heads, the headers, or both?  I am planning to run only about 6 psi of boost through the carburetors so might not see as much restriction as you did.

Thanks Jyrkä. And in that chart temp 4 is temperature at intake duct after intercooler and that shows that our intercooler was very effective. Only +35 degrees celsius after eight pulls.



We didn't measure the before intercooler temperatures however.



No detonation issues with 33 degrees of advance at full throttle.

 Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)

Ford
Test number	8
Barom [mbar]	1020
Humidity [%]	40
Total coeff	1,022
Fuel S.G.	0,746
	Torque Nm	CTorque Nm	CPower hp	Air temp C	H2O C	temp4 C	OIL p Bar	Boost Bar	Fuel P Bar	EG Press 4 Bar	Lambda 1	Lambda 2	Fuel g/kWh	Fuel l/h
2600	619,4	630,3	229,7	22,9	71,6	29,6	4,8	0,67	4,53	0,62	0,81	0,8	355	45
2700	613,0	623,8	236,1	23,0	71,6	30,0	4,9	0,68	4,54	0,65	0,8	0,79	354	47
2800	607,7	618,4	242,8	23,0	71,6	30,3	4,9	0,7	4,55	0,67	0,79	0,79	362	49
2900	601,0	611,6	248,6	23,0	71,6	30,5	4,9	0,72	4,56	0,69	0,76	0,78	358	50
3000	595,8	606,3	255,3	23,0	71,6	30,7	4,9	0,72	4,56	0,71	0,75	0,78	366	52
3100	590,6	601,0	261,2	23,0	71,6	30,8	5,0	0,73	4,56	0,73	0,74	0,76	365	53
3200	584,3	594,7	267,0	23,0	71,6	31,0	5,0	0,73	4,56	0,74	0,73	0,75	368	55
3300	575,2	585,3	270,9	23,1	71,6	31,2	5,1	0,73	4,54	0,75	0,73	0,74	370	56
3400	565,1	575,1	273,9	23,1	71,5	31,3	5,0	0,72	4,53	0,77	0,73	0,74	375	57
3500	555,8	565,6	277,4	23,1	71,5	31,5	5,0	0,72	4,53	0,78	0,72	0,73	380	59
3600	547,0	556,7	280,6	23,1	71,5	31,6	5,0	0,72	4,52	0,8	0,72	0,72	378	59
3700	539,9	549,5	285,1	23,1	71,5	31,7	5,0	0,71	4,51	0,82	0,73	0,72	382	61
3800	534,0	543,4	289,5	23,1	71,5	31,8	5,0	0,71	4,5	0,84	0,74	0,72	390	63
3900	526,7	536,1	292,8	23,1	71,5	31,9	5,0	0,71	4,49	0,86	0,73	0,73	392	64
4000	519,4	528,6	296,5	23,1	71,5	32,1	5,0	0,71	4,49	0,88	0,73	0,74	396	65
4100	513,4	522,5	300,3	23,1	71,5	32,2	5,0	0,7	4,48	0,9	0,73	0,74	395	66
4200	507,6	516,6	304,3	23,1	71,5	32,2	5,0	0,7	4,47	0,92	0,74	0,74	392	66
4300	502,0	510,9	308,1	23,2	71,5	32,4	5,0	0,69	4,46	0,94	0,74	0,75	385	66
4400	497,6	506,4	312,5	23,2	71,5	32,5	5,0	0,68	4,45	0,96	0,74	0,75	382	67
4500	495,4	504,2	318,5	23,2	71,4	32,6	5,1	0,68	4,44	0,98	0,74	0,75	385	68
4600	493,1	501,9	324,0	23,2	71,5	32,8	5,0	0,67	4,41	1	0,74	0,75	394	71
4700	486,3	495,0	326,6	23,2	71,4	33,1	5,0	0,67	4,4	1,02	0,74	0,75	397	72
4800	479,5	488,1	328,8	23,2	71,4	33,5	5,0	0,66	4,39	1,03	0,74	0,75	403	74
4900	470,8	479,2	329,5	23,3	71,2	34,0	5,0	0,66	4,38	1,05	0,74	0,74	410	75
5000	459,2	467,5	328,0	23,3	70,9	34,5	5,1	0,66	4,38	1,06	0,74	0,74	413	76
5100	447,9	455,9	326,0	23,3	70,7	34,9	5,1	0,65	4,36	1,07	0,73	0,73	427	77
5200	433,6	441,3	322,0	23,3	70,5	35,4	5,1	0,64	4,35	1,07	0,73	0,73	434	78

-jyrki from Finland-

www.hollowheads.net

Soorrryyy!!!!





Megasquirt DIY-EFI-system, 30lbs injectors, JAW DIY-wideband, Hollow Head Racing Team aluminum intake manifold by head engineer Seppo Kokko.



Hyvinkää, FI