lookforjoe Posted January 2, 2016 Report Share Posted January 2, 2016 8 hours ago, VulvaS40T4 said: Runners are total 10" from intake valve to plenium. Just runners from intake manifold flange are 6.5". Optimum length would be 12" from intake valve on my engine but space wont allow it. Runner size is now optimal and also shape is okay now so im hoping to get 190hp flow with intake manifold on cylinder head. Cylinder head alone flows 204hp. :) What did you do in terms of head work? Do you use larger valves? Do you port the intake runner / trim valve guide intrusion? I know you mentioned higher lift / longer duration cams. Quote Link to comment Share on other sites More sharing options...
Sute Posted January 3, 2016 Report Share Posted January 3, 2016 As I and Vulva are running on high rpms and with very thin low rpm torque, I´m a fan for this type of a single plenum intake manifold design: http://www.edelbrock.com/automotive/mc/manifolds/honda/victor.shtml Quote Link to comment Share on other sites More sharing options...
VulvaS40T4 Posted January 3, 2016 Author Report Share Posted January 3, 2016 9 hours ago, lookforjoe said: What did you do in terms of head work? Do you use larger valves? Do you port the intake runner / trim valve guide intrusion? I know you mentioned higher lift / longer duration cams. I have stock 31mm / 27mm valves and ported exhaust and intake side of head. Also trimmed valve guides and valve jobs done with round seats on valves. So nothing special. Intake side off head could be ported more but no need for now. :) Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted January 3, 2016 Report Share Posted January 3, 2016 4 hours ago, VulvaS40T4 said: I have stock 31mm / 27mm valves and ported exhaust and intake side of head. Also trimmed valve guides and valve jobs done with round seats on valves. So nothing special. Intake side off head could be ported more but no need for now. :) Ah, Ok. When you said there was no need for reshaping the flange ports, I was assuming that didn't mean the throats in the head hadn't been trimmed back for better flow. What do you mean by round seats on valves? You don't use the traditional 3 to 5 angle cuts on the backside of the valve for flow? Quote Link to comment Share on other sites More sharing options...
VulvaS40T4 Posted January 3, 2016 Author Report Share Posted January 3, 2016 No traditional 3 to 5 angle cuts but round shape on those. I dont know english word for that but its not anything special. :) Its like angle cuts are smooth like R-seat what we call here in finland. Quote Link to comment Share on other sites More sharing options...
fyrken Posted January 3, 2016 Report Share Posted January 3, 2016 14 hours ago, Sute said: As I and Vulva are running on high rpms and with very thin low rpm torque, I´m a fan for this type of a single plenum intake manifold design: http://www.edelbrock.com/automotive/mc/manifolds/honda/victor.shtml We use that very plenum on a 721 whp S40 T4, but we increased the volume when having the inlet in the bottom. Works very well. Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted January 4, 2016 Report Share Posted January 4, 2016 3 hours ago, fyrken said: We use that very plenum on a 721 whp S40 T4, but we increased the volume when having the inlet in the bottom. Works very well. Makes sense, since that is designed for only 1.8l displacement. I went for over displacement volume with mine. Quote Link to comment Share on other sites More sharing options...
Sute Posted January 4, 2016 Report Share Posted January 4, 2016 11 hours ago, fyrken said: We use that very plenum on a 721 whp S40 T4, but we increased the volume when having the inlet in the bottom. Works very well. I did not notice any restrictions with respect of intake manifold when exceeding 900 horses at crank. Or what do you actually mean by "having inlet in the bottom"? Quote Link to comment Share on other sites More sharing options...
fyrken Posted January 4, 2016 Report Share Posted January 4, 2016 2 minutes ago, Sute said: I did not notice any restrictions with respect of intake manifold when exceeding 900 horses at crank. Or what do you actually mean by "having inlet in the bottom"? Ah nice, you did engine dyno! We only did at the tires (Superflow) but will try at the hubs with RotoTest come spring. I am not sure about the performance of the intake since no other designs were tested. If we would have done it different we would have opted to even bigger plenum with the same runners. Now the customer had this Honda intake so we built with this and with hindsight we would have made it all custom since it did required alot of modifications to have it fit the RN N/A head with good flow in mind. We moved inlet for better air flow path. The car is not run in the winter time so ice build-up is not an issue (we have a good intercooler, but not that good ) Some additional pictures of it can be found here: http://www.prd.se/sv/volvo-s40-t4/ We use the D5 starter from 2006 or so. It has top mounted solenoid which gave us extra clearance. 2 Quote Link to comment Share on other sites More sharing options...
Sute Posted January 4, 2016 Report Share Posted January 4, 2016 2 hours ago, fyrken said: Ah nice, you did engine dyno! We only did at the tires (Superflow) but will try at the hubs with RotoTest come spring. I am not sure about the performance of the intake since no other designs were tested. If we would have done it different we would have opted to even bigger plenum with the same runners. Now the customer had this Honda intake so we built with this and with hindsight we would have made it all custom since it did required alot of modifications to have it fit the RN N/A head with good flow in mind. We moved inlet for better air flow path. The car is not run in the winter time so ice build-up is not an issue (we have a good intercooler, but not that good ) Some additional pictures of it can be found here: http://www.prd.se/sv/volvo-s40-t4/ We use the D5 starter from 2006 or so. It has top mounted solenoid which gave us extra clearance. Actually, I did a hub dyno and that´s calculated crank power. That´s something I have had on my mind. Thanks for sharing the pic! Quote Link to comment Share on other sites More sharing options...
VulvaS40T4 Posted January 6, 2016 Author Report Share Posted January 6, 2016 Flow tested new modded intake manifold. Same result with + - 0hp difference. Cannot understand this but will have to test on dyno next if flow bench does not tell hole story. :) Quote Link to comment Share on other sites More sharing options...
Simply Volvo Posted January 6, 2016 Report Share Posted January 6, 2016 2 hours ago, VulvaS40T4 said: Flow tested new modded intake manifold. Same result with + - 0hp difference. Cannot understand this but will have to test on dyno next if flow bench does not tell hole story. :) Is it possible the the inlet from the diffuser to the plenum is causing a restriction? What is the flow on the edelbrock manifolds, that other s40 users use? Did you end up flow testing the stock manifold? Im very curious to know the flow. ~Matt Quote Link to comment Share on other sites More sharing options...
VulvaS40T4 Posted January 6, 2016 Author Report Share Posted January 6, 2016 We try next to increase that last slot between diffucer to plenium connection. It is now sized to 63mm area and will be 70mm next. My throttleplate is 56mm size and boost pipes are 60mm/56mm. Stock volvo intake manifold flowed with my cylinder head 170hp and this new modded manifold flowed 177.5hp, just cylinder head flowed 204hp 11mm lift. Quote Link to comment Share on other sites More sharing options...
VulvaS40T4 Posted January 7, 2016 Author Report Share Posted January 7, 2016 (edited) New slots 140x16mm and 140x16mm which are like 75mm round throttle body size. :) Earlier had 110x11mm and 123x16mm which are like 63mm round throttle body size. Lets see what happens. :D 40% bigger than earlier slots... Edited January 7, 2016 by VulvaS40T4 1 Quote Link to comment Share on other sites More sharing options...
VulvaS40T4 Posted January 7, 2016 Author Report Share Posted January 7, 2016 Ready. 1 Quote Link to comment Share on other sites More sharing options...
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